化简sin(x)cos(x)cos(2x)
化简 cos^2(x)*sin^2(x)-sin^2(x)
化简 cos^(2)(x)*sin^(2)(x)-sin^(2)(x)
化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x))
化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)
化简 1/2cos x-根号3/2sin x 根3sin x+cos x
cos 2x /sin^2 x*cos^2 x不定积分
2cos x (sin x -cos x)+1
化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
化简sin(派-x)+sin(派+x)-cos(-x)+cos(2派-x)-tan(派+x)cot(派-x)
化简f(x)=2cos(x/2)·(sin(x/2)+cos(x/2))-1
(sin^2x+cos^2x )(sin^2x-cos^2x)怎么得sin^2x-cos^2x?