

1, 6cos^2x - sin^2x= mcos2x
2, sin^6x + cos^6x= m(sin^4x +cos^4x)
3, sin^2x +(2m-2)sinx.cosx -(m-1)cos^2=m
<<Phiền mn làm giúp mk nhé^-^>>
2, sin^6x + cos^6x= m(sin^4x +cos^4x)
3, sin^2x +(2m-2)sinx.cosx -(m-1)cos^2=m
<<Phiền mn làm giúp mk nhé^-^>>