Question

`(d/dx) (tan^(-1)(x/2))(4+x^2)`=?? (a) 4 (b) 1 (c) 2 (d) None of them

Answer 1

The answer is (c) 2

Explanation:

`d/dx (tan^-1(x/2))(4+x^2)`

`(2(4+x^2))/(x^2+4)=2`