Question

Nth differential coefficient of cos^4x​

Answer 1

Answer:

cos^4(x) = (1/4)(1+ cos(2x))^2 = (1/4)(1 + 2cos(2x)+cos^2 (xx)) = 1/4 + (1/2)cos(2x) + (1/8)(1 + cos(4x)) = 3/8 + (1/2)cos(2x) + (1/8) cos(4x)

and you can continue to find the nth derivative