Помогите пожалуйста решить подробно. 1) cos x/2 = 1+cos x 2) tg x - tg( 7pi/2 -x) = 1 3) 5 cosx +12 sinx = 13 4) cos 2x = 2 целых 1/3 sin x 5) корень из 3 * sin x - cos x =0
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