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" "

Find the value of: `tan1/2[sin^(-1)(2x)/(1+x^2)+cos^(-1)(1-y^2)/(1+y^2

1.	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" "
Answer» `tan""(1)/(2)[sin^(-1)""(2x)/(1+x^(2))+cos^(-1)""(1-y^(2))/(1+y^(2))]` `=tan{(1)/(2)(2 tan^(-1)x+2 tan^(-1)y)}" " { :. 2 tan^(-1)=sin^(-1)""(2x)/(1+x^(2)) and 2 tan^(-1)y=cos^(-1)""(1-y^(2))/(1-xy)}` `=tan(tan^(-1)x+tan^(-1)y)` `=tan(tan^(-1)""(x+y)/(1-xy))=(x+y)/(1-xy)`

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)`
The Principal value of `os^(-1) (sqrt(3)/(2))` is :A. `(pi)/(8)`B. `(pi)/(6)`C. `(pi)/(3)`D. None of these
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" "