Question

Find dy/dx when y =

`√((1 + cosx)/( 1 - cosx))`
​

Answer 1

cos(x)

Explanation:

(1 + cos(x))(1 - cos(x)) = 1 - cos²(x) = sin²(x)

sqrt(sin²(x)) = sin(x)

sin'(x) = cos(x)