sin(50+x)cos(10-x)-cos(130-x)sin(170+x) 快.

sin(50+x)cos(10-x)-cos(130-x)sin(170+x) 快. c语言 sin(x)+cos(x)编程 求值：sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x) cos x/sin x+sin x/(1+cos x) 化简. sin（sin（sin（sin（x）=cos（cos（cos（cos（x）,X等于多少? cos x /sin x= (x*sin x*cos x)的导数 cos(sin x)怎么解 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x ∫sin(7x)cos(10x)dx=? 关于三角函数的一道题（高中）cos(10)*cos(20)*cos(40)=?类似cos(X)*cos(2x)*cos(4x)=?sin(x)*sin(2x)*sin(4x)=?的题目有没有什么规律 化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x)) 2cos x (sin x -cos x)+1 sin(360--x)cos(180+x)cos(90+x) y=2cos x (sin x+cos x) 化简sin(x)cos(x)cos(2x) 化简sin(x)cos(x)cos(2x)