помогите решить! 1. sin6x*ctg4x*tg3x=0 2. sin^2(x)+5sin(x)*cos(x)+4cos^2(x)=0  3. 4sin^2(2x)-2,5sin(4x)+7cos^2(2x)=3 4. 2tg^2(x)-tg(x)=1 
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