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giải phương trình:
1) 2sin4x+ 16sin^3 x.cosx +3cos2x =5
2) 2cos^3 x +sinx -3sin^2 x.cosx =0
3) 1- sinx = cosx( sinx+ cosx)
4) sin^ 2 x + sin^2 2x = sin^2 3x
1) 2sin4x+ 16sin^3 x.cosx +3cos2x =5
2) 2cos^3 x +sinx -3sin^2 x.cosx =0
3) 1- sinx = cosx( sinx+ cosx)
4) sin^ 2 x + sin^2 2x = sin^2 3x