`tan^(-1).(x(x+1)+1)/((x+1)-x)` `=tan^(-1) (x^(2) +x^+1)` = R.H.S

1.	`tan^(-1).(x(x+1)+1)/((x+1)-x)` `=tan^(-1) (x^(2) +x^+1)` = R.H.S
Answer» `sin.(7pi)/(4) = sin (2pi -(pi)/(4))= -sin .(pi)/(4)= - (1)/sqrt(2)` `therefore sin^(-1)(sin .(7pi)/(4)) = sin^(-1) (sin.(pi)/(4)) = - (pi)/(4)`

Discussion

If `sin ^(-1) .(2a)/(1+a^(2))+ coses^(2) (cot ^(-1) 3) y =?`A. `(a+b)/(1-ab)`B. `(a+b)/(1+ab)`C. `(a-b)/(1+ab)`D. None of these
Prove that:`tan^(-1)1/5+tan^(-1)1/7+tan^(-1)1/3+tan^(-1)1/8=pi/4`
`If"sin"{cot^(-1)(x+1)}="cos"(tan^(-1)x),`then find `xdot`A. `sqrt((x^(2)+2)/(x^(2)+1))`B. `(x)/sqrt(x^(2)+1)`C. `(x)/sqrt(x^(2)+2)`D. `sqrt((x^(2) +1)/(x^(2) + 2))`
If `(tan^(-1)x)^2+(cot^(-1)x)^2=(5pi^2)/8,`then find `xdot`A. 1B. -1C. `(1)/sqrt(3)`D. `-(1)/sqrt(3)`
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If `sin(sin^(-1)1/5+cos^(-1)x)=1,`then find the value of `xdot`
`sec^(2) (tan^(-1) 4) + cosec^(2) (cot ^(-1) 3) =?`A. 30B. 29C. 27D. 25
`tan^(-1)sqrt(3)-cot^(-1)(-sqrt(3))`is equal to(A) `pi` (B) `-pi/2` (C) 0 (D) `2sqrt(3)`A. `pi`B. `-(pi)/(2)`C. `0`D. `2sqrt(3)`
Prove that:`sin^(-1)8/(17)+sin^(-1)3/5=tan^(-1)(77)/(36)`
Find the value of: `tan1/2[sin^(-1)(2x)/(1+x^2)+cos^(-1)(1-y^2)/(1+y^2)],|x|0`and `x y" "