sin^2x+cos^2x等于几
sin^2(x)cos^2(x)积分等于多少
cos^2x-sin^2x等于多少?
[sin^2(x)-cos^2(x)] 为什么等于-cos2x
证明sin x+cos x的最大值等于 根号2
cos^4(x)-sin^4(x)等于?是cos^2(x)还是cos2x
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
y=sin^2x-3sinxcosx+4cos^2x是否等于y=sin^2x+cos^2x+3cos^2x-3/2*si
已知sin X+cos X=m,|m|小于等于根号2且|m|不等于1,求sin X^3+cos X^3,sin X^4+
cos 2x /sin^2 x*cos^2 x不定积分
2cos x (sin x -cos x)+1
(sin^2x+cos^2x )(sin^2x-cos^2x)怎么得sin^2x-cos^2x?