Question

d/dx ((Cot^2 x - 1)/(Cot^2 x + 1)) =​

Answer 1

Answer:

(d/dx) (cot2x -1)/(cot2 x+1) = (d/dx)(cos2x- sin2x)/(cos2x+ sin2x)

= (d/dx) cos 2x

= -2 sin 2x

Hence option (4) is the answer.

Step-by-step explanation:

(4) -2 sin 2x