Пожалуйста, помогите решить хотя бы один! Решите уравнение:
а) 3sin^2x+2√3sinxcosx+cos^2x=0;
б) sin^2x+2√3sinxcosx+3cos^2x=0;
в) sin^2x-2√3sinxcosx+3cos^2x=0.
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