$Let f(x) = ∣ ∣ cos x sin x cos x cos 2 x sin 2 x 2 cos 2 x cos 3 x sin 3 x 3 cos 3 x ∣ ∣ Then find the vlue of f^{'} (0) and f^{'} (π / 2) .$

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Let f(x) = ∣ ∣ cos x sin x cos x cos 2 x sin 2 x 2 cos 2 x cos 3 x sin 3 x 3 cos 3 x ∣ ∣ Then find the vlue of f^{'} (0) and f^{'} (π / 2) .

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Question Text

Let f(x) = ∣ ∣ cos x sin x cos x cos 2 x sin 2 x 2 cos 2 x cos 3 x sin 3 x 3 cos 3 x ∣ ∣ Then find the vlue of f^{'} (0) and f^{'} (π / 2) .

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