Решите только 1 под б и 2ое 1. a)cos^2 ( 3x+ pi/4) - sin^2(3x+pi/4)+ корень из 3/2=0
б) х принадлежит [ 3pi/4; pi]
2. (cos x - sin x) ^2 = 1- 2 sin 2 x
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