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I — cos2x 2cosx 2 + 2cosx+ = 0 (cos.x + t)' cosx I = O Use the Pythagorean identity sin2x I — cos2x. Combine like terms. Factor. Set each factor equal to zero, 1 The solution set over is cos.X = — the solutions to trigonometric equation are not multiples of the special angles 0, 77 77 ................
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