Trigonometric EquationHard

Question

[(x + π)3 + cos2(x + 3π)]dx is equal to

Options

A.
B.
C.
D.

Solution

I = [(x + π)3 + cos2(x + 3π)]dx
Put x + π = tI = [t3 + cos2 t]dt = 2cos2t dt
= (1 + cos 2t)dt = + 0

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