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8651.

The set of real values of x satisfying the equation |x−1|log3(x2)−2logx(9)=(x−1)7is

Answer»

The set of real values of x satisfying the equation

|x1|log3(x2)2logx(9)=(x1)7

is



8652.

If y=ax+x2+1n+bx-x2+1-n, prove that x2+1d2ydx2+xdydx-n2y=0.Disclaimer: There is a misprint in the question, x2+1d2ydx2+xdydx-n2y=0 must be written instead of x2-1d2ydx2+xdydx-n2y=0.

Answer» If y=ax+x2+1n+bx-x2+1-n, prove that x2+1d2ydx2+xdydx-n2y=0.



Disclaimer: There is a misprint in the question, x2+1d2ydx2+xdydx-n2y=0 must be written instead of x2-1d2ydx2+xdydx-n2y=0.
8653.

WHY DIFFERENTIATION OF X^2 IS 2X*DX(X)/DT AND NOT 2X?

Answer» WHY DIFFERENTIATION OF X^2 IS 2X*DX(X)/DT AND NOT 2X?
8654.

Show that the points ^i−^j+3^k and 3(^i+^j+^k) are equidistant from the plane →r.(5^i+2^j−7^k)+9=0 and lies on opposite side of it.

Answer»

Show that the points ^i^j+3^k and 3(^i+^j+^k) are equidistant from the plane r.(5^i+2^j7^k)+9=0 and lies on opposite side of it.

8655.

If alpha beta and gama are the roots of the equation x'3+4x+1=0 then (alpha+beta)'-1 +(beta+gama)'-1+(alpha+gama)'-1 is

Answer» If alpha beta and gama are the roots of the equation x'3+4x+1=0 then (alpha+beta)'-1 +(beta+gama)'-1+(alpha+gama)'-1 is
8656.

The point on the curve y=ex which is at shortest distance from the line y=x−4, is

Answer»

The point on the curve y=ex which is at shortest distance from the line y=x4, is

8657.

The letters of word OUGHT are written in all possible orders and these words are written out as in a dictionary. Then the rank of the word TOUGH is

Answer»

The letters of word OUGHT are written in all possible orders and these words are written out as in a dictionary. Then the rank of the word TOUGH is

8658.

Let y=y(x) be the solution of the differential equation (y+1)tan2xdx+tanxdy+ydx=0,x∈(0,π2). If limx→0−xy(x)=1, then the value of y(π4) is

Answer»

Let y=y(x) be the solution of the differential equation (y+1)tan2xdx+tanxdy+ydx=0,x(0,π2). If limx0xy(x)=1, then the value of y(π4) is

8659.

[(1+cosA)/sinA] = [sinA/(1-cosA)]

Answer»

[(1+cosA)/sinA] = [sinA/(1-cosA)]

8660.

The resis†an ce R=v/i where v=(100_+5

Answer» The resis†an ce R=v/i where v=(100_+5
8661.

If tan(A+B) =p and tan(A-B) = q, then write the value of tan2B.

Answer» If tan(A+B) =p and tan(A-B) = q, then write the value of tan2B.
8662.

How to expand scalar triple product and vector triple product?

Answer» How to expand scalar triple product and vector triple product?
8663.

-1 63167.+CoS13

Answer» -1 63167.+CoS13
8664.

limx→0amx−1bnx−1,n≠0

Answer»

limx0amx1bnx1,n0

8665.

91. If alpha and beta are roots of equation x(square) + px - q = 0 and gama and delta are roots of equation x (square) + px + r = 0 . Then prove that the value of (alpha-gama)(alpha-delta) is (q+r).

Answer» 91. If alpha and beta are roots of equation x(square) + px - q = 0 and gama and delta are roots of equation x (square) + px + r = 0 . Then prove that the value of (alpha-gama)(alpha-delta) is (q+r).
8666.

Theprobability of obtaining an even prime number on each die, when apair of dice is rolled is(A) 0 (B) (C) (D)

Answer»

The
probability of obtaining an even prime number on each die, when a
pair of dice is rolled is




(A) 0 (B) (C) (D)

8667.

If the ratio of 8 cookies in the purchased boxes to unpurchased stored boxes in the cookie shop is 8 : 2, then the number of the remaining cookies in unpurchased stored boxes in the cookies shop are .

Answer» If the ratio of 8 cookies in the purchased boxes to unpurchased stored boxes in the cookie shop is 8 : 2, then the number of the remaining cookies in unpurchased stored boxes in the cookies shop are .
8668.

Is f(x) = +or-x a function?

Answer» Is f(x) = +or-x a function?

8669.

If a chord of the circle x2+y2−4x−2y−c=0 is trisected at the points (1/3, 1/3) and (8/3, 8/3), then

Answer»

If a chord of the circle x2+y24x2yc=0 is trisected at the points (1/3, 1/3) and (8/3, 8/3), then


8670.

The circle passing through (1,−2) and touching the axis of x at (3,0) also passes through the point

Answer»

The circle passing through (1,2) and touching the axis of x at (3,0) also passes through the point

8671.

If α,β be the roots of x2+px+q=0 and α+h, β+h are the roots of x2+rx+s=0 , then

Answer»

If α,β be the roots of x2+px+q=0 and α+h, β+h are the roots of x2+rx+s=0 , then


8672.

If A,B,C are the angles of triangle such that 0<A≤π3, then the range of tanB+tanCtanBtanC−1 is

Answer»

If A,B,C are the angles of triangle such that 0<Aπ3, then the range of tanB+tanCtanBtanC1 is

8673.

Locus of all such points from where the tangents drawn to the ellipse x2a2+y2b2=1 are always inclined at 45∘ is

Answer» Locus of all such points from where the tangents drawn to the ellipse x2a2+y2b2=1 are always inclined at 45 is
8674.

Solve √3 cos x+sin x=√2.

Answer»

Solve 3 cos x+sin x=2.

8675.

La Charlie's principal

Answer» La Charlie's principal
8676.

If 3n−an−b is divisible by 4 for n∈N, then maximum value of a+b=(where a,b∈N are fixed constants)

Answer» If 3nanb is divisible by 4 for nN, then maximum value of a+b=

(where a,bN are fixed constants)
8677.

Find the probability of throwing at most 2 sixes in 6 throws of a single die.

Answer» Find the probability of throwing at most 2 sixes in 6 throws of a single die.
8678.

Solve the following equations :(i) cot θ+tan θ=2(ii) 2 sin2θ=3 cosθ, 0 ≤ θ ≤ 2π(iii) sec θ cos 5θ+1=0, 0&lt; θ&lt;π2(iv) 5 cos2θ+7 sin2θ−6=0(v) sin x−3 sin 2x+sin 3x=cos x−3 cos 2x+cos 3x

Answer»

Solve the following equations :(i) cot θ+tan θ=2(ii) 2 sin2θ=3 cosθ, 0 θ 2π(iii) sec θ cos 5θ+1=0, 0< θ<π2(iv) 5 cos2θ+7 sin2θ6=0(v) sin x3 sin 2x+sin 3x=cos x3 cos 2x+cos 3x

8679.

Match List I with the List II and select the correct answer using the code given below: List IList II(A)If E1 and E2 be mutually exclusive events, then1E1∩E2=E1(B)If E1 and E2 are mutually exclusive and exhaustive events, then2(E1−E2)∪(E1∩E2)=E1(C)If E1 and E2 have common outcomes, then3E1∩E2=ϕ,E1∪E2=S(D)If E1 and E2 are events such that E1⊂E2, then4E1∩E2=ϕWhich of the following is the only CORRECT combination?

Answer»

Match List I with the List II and select the correct answer using the code given below:



List IList II(A)If E1 and E2 be mutually exclusive events, then1E1E2=E1(B)If E1 and E2 are mutually exclusive and exhaustive events, then2(E1E2)(E1E2)=E1(C)If E1 and E2 have common outcomes, then3E1E2=ϕ,E1E2=S(D)If E1 and E2 are events such that E1E2, then4E1E2=ϕ



Which of the following is the only CORRECT combination?

8680.

If ω≠1 is a cube root of unity and ∣∣∣∣∣x+ω2ω1ωω21+x1x+ωω2∣∣∣∣∣=0, then value of x is

Answer»

If ω1 is a cube root of unity and

x+ω2ω1ωω21+x1x+ωω2

=0
, then value of x is



8681.

19.sin x cos3x

Answer» 19.sin x cos3x
8682.

Minor M33 (Minor of the element of ith row and jth column) of the determinant ∣∣∣∣2352−18124∣∣∣∣ is

Answer»

Minor M33 (Minor of the element of ith row and jth column) of the determinant
235218124
is



8683.

Prove that 2sin2π6+cosec27π6cos2π3=32

Answer» Prove that 2sin2π6+cosec27π6cos2π3=32
8684.

Using the method of integration find the area of the region bounded by lines: 2 x + y = 4, 3 x – 2 y = 6 and x – 3 y + 5 = 0

Answer» Using the method of integration find the area of the region bounded by lines: 2 x + y = 4, 3 x – 2 y = 6 and x – 3 y + 5 = 0
8685.

The principle solutions of the trigonometricequation sec θ=2√3 are

Answer» The principle solutions of the trigonometricequation sec θ=23 are
8686.

An unbiased coin is tossed 50 times . Find the probablity of getting TAIL\:odd number of times .

Answer» An unbiased coin is tossed 50 times . Find the probablity of getting TAIL\:odd number of times .
8687.

If A=ln x-1-ln x2 and if det (A) = 2, then x = ___________.

Answer» If A=ln x-1-ln x2 and if det (A) = 2, then x = ___________.
8688.

Let P be the point on the parabola, y2=8x, which is at a minimum distance from the centre C of the circle,x2+(y+6)2=1. Then, the equation of the circle, passing through C and having its centre at P is

Answer»

Let P be the point on the parabola, y2=8x, which is at a minimum distance from the centre C of the circle,x2+(y+6)2=1. Then, the equation of the circle, passing through C and having its centre at P is

8689.

Evaluate the following integrals:∫logxx+12dx

Answer» Evaluate the following integrals:



logxx+12dx
8690.

What is Cos(225)°?

Answer»

What is Cos(225)°?

8691.

In a ΔABC, side b is equal to

Answer»

In a ΔABC, side b is equal to



8692.

The value of is (A) 0 (B) –1 (C) 1 (D) 3

Answer» The value of is (A) 0 (B) –1 (C) 1 (D) 3
8693.

Let f be a one-one function with domain {x,y,z} and range {1,2,3}. It is given that only one of the three conditions given below is true and remaining two are false. f(x)=1,f(y)≠1,f(z)≠2. Then

Answer»

Let f be a one-one function with domain {x,y,z} and range {1,2,3}. It is given that only one of the three conditions given below is true and remaining two are false. f(x)=1,f(y)1,f(z)2. Then



8694.

Examine if Rolle’sTheorem is applicable to any of the following functions. Can you saysome thing about the converse of Rolle’s Theorem from theseexamples?(i) (ii) (iii)

Answer»

Examine if Rolle’s
Theorem is applicable to any of the following functions. Can you say
some thing about the converse of Rolle’s Theorem from these
examples?



(i)


(ii)


(iii)

8695.

If the projections of the line segment AB on the coordinate axes are 2,k,4 and AB=7√2, then 2k2−√2k+1 is equal to

Answer»

If the projections of the line segment AB on the coordinate axes are 2,k,4 and AB=72, then 2k22k+1 is equal to

8696.

limx→0sin24x2x4

Answer»

limx0sin24x2x4

8697.

Show by the Principle of Mathematical induction that the sum Sn of then terms of the series 12+2×22+32+2×42+52+2×62+72+... is given bySn=nn+122, if n is evenn2n+12, if n is odd [NCERT EXEMPLAR]

Answer» Show by the Principle of Mathematical induction that the sum Sn of then terms of the series 12+2×22+32+2×42+52+2×62+72+... is given by



Sn=nn+122, if n is evenn2n+12, if n is odd [NCERT EXEMPLAR]
8698.

Find theintervals in which the function f given by f(x)= 2x3 − 3x2 − 36x+ 7 is(a) strictlyincreasing (b) strictly decreasing

Answer»

Find the
intervals in which the function f given by f(x)
= 2x3 − 3x2 − 36x
+ 7 is


(a) strictly
increasing (b) strictly decreasing

8699.

The range of p for which the number 6 lies between the roots of x2+2(p−3)x+9=0 is

Answer»

The range of p for which the number 6 lies between the roots of x2+2(p3)x+9=0 is

8700.

If z1 and z2 are two non-zero complex numbers such that |z1−z2|=||z1|−|z2|| then arg(z1)−arg(z2)=

Answer»

If z1 and z2 are two non-zero complex numbers such that |z1z2|=||z1||z2|| then arg(z1)arg(z2)=