Решить подробно. Срочно. Дам лучшее за все. ^2 - знак степени синуса или косинуса.
1) 2cos^2x+sinx+1=0
2) cos^2x+3sinx=3
3) 4cosx=4-sin^2x
4) 8sin^2x+cosx+1=0
5) 3sin^2x+sinxcosx=2cos^2x
6) 2cos^2x-3sinxcosx+sin^2x=0
7) 9sinxcosx-7cos^2x=2sin^2x
8) 2sin^2x-sinxcosx=cos^2x.
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