Решите уравнения а) Cos(П/2+x) = √3/2

б) 9sin4x=0

в) cos(квадрат)x-sin(квадрат)x=0,5

г) 2sinxcosx=0,5

д)cos(П+ x)= sinП/2

е) (1/(sin(квадрат)x) -1) * корень из 4-(x(квадрат))
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