求解sin(x-15)cos(x+15)+cos(x-15)sin(x+15)

sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简 sin（sin（sin（sin（x）=cos（cos（cos（cos（x）,X等于多少? 若f(cos x)=cos 2x,则f(sin 15度）的值? 微积分求解：∫sin^3 (x) cos^2 (x) dx cos^3(2x)sin(2x)dx求解 5sin^2(X)+sin(2X)-cos^2(X)=1, 求解X sin(1/x)-cos(1/x)/x (x*sin x*cos x)的导数 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x)) cos 2x /sin^2 x*cos^2 x不定积分 2cos x (sin x -cos x)+1