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f(x)+f(y=f((x+y)/(1-x y)) for allx ,y i...

`f(x)+f(y_=f((x+y)/(1-x y))` for all`x ,y in Rdot` `(x y!=1),a n d(lim)_(xvec0)(f(x))/x=2.F in df(1/(sqrt(3)))a n df^(prime)(1)dot`

A

`f((1)/(sqrt(3)))=(pi)/(3)`

B

`f((1)/(sqrt(3))) =-(pi)/(3)`

C

`f'(1) = 1`

D

`f'(1) = -1`

Text Solution

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The correct Answer is:
A, C
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