Простое задание решите
Решите:
a)5sinx+cosx=5
б)4sinx^2+5sinxcosx-cos^2=2
в)sin^4x+cos^4x=sin2x-1/2
г)cos3x-1/2=0
д)5tg^2x-2tgx-3
е)5tg^2x-2tgx*3
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