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kittybabykut3_97


1) $cos^2x-3cosx+2=0$
2, $sin^2x+4cosx-4=0$
3, $2cos2x+2cosx-căn 2=0$
4, $2sin^2x-5sinxcosx-cosx+2=0$
2, $sin^2x+4cosx-4=0$
3, $2cos2x+2cosx-căn 2=0$
4, $2sin^2x-5sinxcosx-cosx+2=0$
Chú ý tiêu đề + latex
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