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c cos2x cosx cos x 1 x 0 2m d 2 sin x cos x 0 x 0 2m c) xe (0.271 d) Zsinxcosx O,
c cos2x cosx cos x 1 x 0 2m d 2 sin x cos x 0 x 0 2m
c) xe (0.271 d) Zsinxcosx O, 10,2rl
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