L
loverain22


giải phương trình:
1) sinx +sin^2 x +sin^3 x +sin^4 x =cosx +cos^2 x +cos^3 x +cos^4 x
2) ( sin^2 + cos^4 2x -1)/ căn( sinx.cosx) = 0
3) ( cosx -2sinx.cosx)/( 2cos^2 x +sinx -1) = căn3
4) 2tgx +cotg 2x =2sin2x +1/ sin2x
1) sinx +sin^2 x +sin^3 x +sin^4 x =cosx +cos^2 x +cos^3 x +cos^4 x
2) ( sin^2 + cos^4 2x -1)/ căn( sinx.cosx) = 0
3) ( cosx -2sinx.cosx)/( 2cos^2 x +sinx -1) = căn3
4) 2tgx +cotg 2x =2sin2x +1/ sin2x