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2sinx — 2 sin x 2 sin x cosx sin 2 sinxcosx 2sinxco_sx cosx (2cos2x — 1 Isinx 2 sinxcosx 2 sin xcosx 2 sin x cosx — 2cosx — —secx — 2cosx — 2 sin A 2sinAcos: A — sin.A ... cos3x — cos2r 4 cosx sin3x — sin2x sinx COS 31 — cos2x 2cos2tcosx — sin + sinx — sin 2K 2sin2.scosx cos2x(2cosx — Ij ................
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