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thienthanxanh_501
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giai phuong trinh sau:
1.cotx+ cot2x+ (sinx.sin5x.sin8x)^-1=0
2.(sinx):4 + cos7x.( 3-4.sin^2x)= cos11x +4.cosx. sin2x
mem of bigzero group![Stick Out Tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
1.cotx+ cot2x+ (sinx.sin5x.sin8x)^-1=0
2.(sinx):4 + cos7x.( 3-4.sin^2x)= cos11x +4.cosx. sin2x
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