Solve `tan^(-1)2x+tan^(-1)3x=pi/4`.A. `1/2` or `-2`B. `1/3` or `-3`C. `1/4` or `-2`D. `1/6` or `-1`

Solve `tan^(-1)2x+tan^(-1)3x=pi/4`.A. `1/2` or `-2`B. `1/3` or `-3`C.

1.	Solve `tan^(-1)2x+tan^(-1)3x=pi/4`.A. `1/2` or `-2`B. `1/3` or `-3`C. `1/4` or `-2`D. `1/6` or `-1`
Answer» Correct Answer - D `tan^(-1)3x+tan^(-1)3=tan^(-1)2x=pi/4 rArr tan^(-1)((3x+2x)/(1-6x^(2))=pi/4`. `therefore (5x)/(1-6x^(2))=tanpi/4 =1 rArr 6x^(2)+5x-1=0` `rArr (x+1)(6x-1)=0`. `rArr x=-1` or `x=1/6`.

Range of `"cosec"^(-1)x` isA. `(-pi/2,pi/2)`B. `[-pi/2,pi/2]`C. `[-pi/2,pi/2]-{0}`D. none of these
The value of `"cosec"^(-1)("cosec"(4pi)/3)` isA. `(3pi)/4`B. `pi/4`C. `-pi/4`D. none of these
Find the principalvalue of `sec^(-1)((-2)/(sqrt(3)))`A. `pi/6`B. `-pi/6`C. `(5pi)/6`D. `(7pi)/6`
The principal value of `"cosec"^(-1)(-sqrt(2))` isA. `-pi/4`B. `(3pi)/4`C. `(5pi)/4`D. none of these
Find the principal value of each of the following: i) `cos^(-1)(-1/sqrt(2))`, ii) `cos^(-1)(-1/2)`, iii) `cot^(-1)(-1/sqrt(3))`
Find the principal value of each of the following: i) `cot^(-1)(-sqrt(3))` ii) `sec^(-1)(-sqrt(2))` iii) `"cosec"^(-1)(-1)`.
The principal value of `cot^(-1)(-1)` isA. `-pi/4`B. `pi/4`C. `(5pi)/4`D. `(3pi)/4`
Find the principal valuesof each of the following:`cot^(-1)(-sqrt(3))`(ii) `cot^(-1)(sqrt(3))`A. `-pi/6`B. `pi/6`C. `(7pi)/6`D. `(5pi)/6`
If `tan^(-1)x=pi/4-tan^(-1)(1/3)` then `x` isA. `1/2`B. `1/4`C. `1/6`D. none of these
The value of `tan^(-1)(tan(8*pi/6))` isA. `(7pi)/6`B. `(5pi)/3`C. `pi/3`D. none of these