if f(x)=tan−1(x)than f(x)+f(y) is equal to:
Given that ,f(x)=tan−1x ….(1)
Put x=y in equation (1) we get
f(y)=tan−1y ….(2)
Add equation (1) and (2)
f(x)+f(y)=tan−1x+tan−1y
Using inverse trigonometry properties, we get
tan−1x+tan−1y =tan−1(x+y1−xy)
This is the answer