34 sin 4x + k
-14 sin 4x + k
-34 sin 4x + k
14 sin 4x + k
Correct answer is D
∫ cos4 x dx
let u = 4x
dydx = 4
dx = dy4
∫cos u. dy4 = 14∫cos u du
= 14 sin u + k
= 14 sin4x + k
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