فضاء التلاميذ والأساتذة والطلبة

1 cos2x cos3x— cos5x A — sin x sin 3 x 2sin 2 x E — cos x + cos2x cos3x cos4x , D = 1+ 2cosx cos2x cos 2 x sin 2 x sin 2 x sin 3 x B sin 4x sin x . 2 (4x) — 2 cos(4 x (2x)) YxeIR—lJ —+ k7t;k e Z sin(8x) sin(8x) B sin sin 8x cos x. cos 2 x .cos 4 x 8 sin x sin 8 sin ................
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