Помогите по алгебре
8.4.
a) cos 7x +cosx = 0;
б) sin²x + sin 2x = 1;
с) sin 7x – sinx = 0;
B) cos^2x – sin 2x= 1.
8.4.
a) cos 7x +cosx = 0;
б) sin²x + sin 2x = 1;
с) sin 7x – sinx = 0;
B) cos^2x – sin 2x= 1.
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