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The function f (x) = 4 sin^3x – 6 sin^2x + 12 sinx + 100 is strictly

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The function f (x) = 4 sin3x – 6 sin2x + 12 sinx + 100 is strictly

(A) increasing in (π, 3π/2)

(B) decreasing in (π/2, π)

(C) decreasing in (- π/2, π/2)

(D) decreasing in (0, π/2 )

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Answer is (B)

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