Ребят, кто может помогите с решением  1)3tgx=ctgx 2)2cos^2x-3sinx=0 3)sin^2(π-x)+cos(π/2+x))=0 4)cos7x-cosx-sin4x=0 5)sinx-√ 3*cosx=0 6)3sinx+5cosx=0   7)sin^2x+6cos^2x+7sinxcosx=0 8)3sin^2x-4sin^2xcosx+cos^2x=0 9)4sin^2x+5sinxcosx-cos^2x=2                          
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