化简 （sin(540°-x))/(tan(900°-x))*(1/(tan(450°-x)tan(810°-x))*((cos(360°-x))/(sin(-x))

求证:Sin^2 x / (sinx-cosx) - (sin x + cos x)/(ta求证:Sin^2 x / (sinx-cosx) - (sin x + cos x)/(tan^2-1) = sin x + cos x 求函数f(x)=sin ax+cos bx的周期为什么要TA/TB是有理数 化简 （sin(540°-x))/(tan(900°-x))*(1/(tan(450°-x)tan(810°-x))*((cos(360°-x))/(sin(-x)) 化简sin(-2x) 化简sin²x f(X)LA ChA TA中文译音! 求 解微分方程组的matlab程序方程组是：dv/dt=-c*n*p/ta*v.^2*cx+g*sin(th)d(th)/dt=g*cos(th)/vdx/dt=v*cos(th)dy/dt=v*sin(th)dp/dt=p/(r*ta)*v*sin(th)已知：c,n,cx,g,r,ta 初值有：p,v,th,x,y,用符号表示,最后给定,如何编写matl cos x/sin x+sin x/(1+cos x) 化简. 化简sin(x+120°）+sin（x+240°） 化简 cos^2(x)*sin^2(x)-sin^2(x) 化简sin^4x-sin^2x+cos^2x 化简:sin^4 x-sin^2 x+cos^2 x 化简 cos^(2)(x)*sin^(2)(x)-sin^(2)(x) 化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x 化简cos(180°+x)*sin(x+360°)/[sin(-x-180°)*cos(-180°-x)] 化简sin(x-25°)sin(65°-x)+cos(x-25°)cos(65°-x)的结果为 cos(27°+x)sin(57°+x)-sin(207°+x)sin(327°+x) 化简[1-(sin^4 x-sin^2 xcos^2 x+cos^4 x)]/(sin^2 x)+3sin^2 x