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3 — 1 = (6 + 2) cos 201 + (2)(2) sin 20: or. 1 - 2sin 20: = 4(1 — sin2201)”2. 1 - 45in 201 + 4sin22a = 16 — 16sin22a or. 20 sin2201 — 4 sin 2a — 15 = 0 (E1.2a) .