Решите тригонометрические уравнения. Хотя бы одно! cos(7X)-cos(X)-sin(4X)=0
sin^2(X)+6cos^2(X)+7sin(X)cos(X)=0
4sin^2(X)+5sin(X)cos(X)-cos^2(X)=2
sin(2X)+корень из 2* sin(x-п/4)=1
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