sin t/1-cos t=cot t怎么推导求助微积分上的一个推导?

sin t/1-cos t=cot t怎么推导求助微积分上的一个推导? 请问 a cos t / - a sin t 为什么会= - cot t (sin t) / ( 1-cos t)= matlab中怎么对下面的程序进行二维插值并画出三维视图呢?[x,y]=meshgrid(-2:1:2);t=2;Z=[(sin(t))^3 t^2 sin(t) cos(t) (sin(t))^2;t^2 sin(t) (cos(t))^4 cos(t) (sin(t))^2;t sin(t) cos(t) t^2 (sin(t))^2;sin(t) (cos(t))^3 t^2 (sin(t))^2 matlab中在哪查看dsolve得出的解我的程序为：syms a b t n>> a=0.0099.*(coth(0.5)-cot(0.05).*exp(-0.1.*t).*(0.1.*cos(t)-sin(t))-0.03184.*cos(t).*symsum(exp(-n.*6.28.*t)./(n-0.015923),n,0,Inf));>> b=0.0099.*(1-exp(-0.1.*t).*cos(t)-0.1.*exp( 求 y=cos t/(1-sin t)的导数 1/1-sin t x=tan(t) sin(t)-cos(t)=? matlab怎么画出三维曲线?t=(0:0.01:1)*pix=25*cos(t)y=(-60+25*sin(t))*(14.82-111*25*sin(t)+1250*sin(t)*sin(t)+1511.18*sin(t)-1511.18)/((50-50*sin(t))*sqrtm(900-61*25*sin(t)+625*sin(t)*sin(t)+1511.18sin(t)))-25sin(t)+sqrtm(1100)z=50-25*sqrtm((360 由参数方程求二阶导数问题计算由摆线的参数方程 x=a(t-sin t) ,y=a(1-cos t)所确定的函数y=y(x)的二阶导数.dy/dx=(dy/dt)/(dx/dt)=(asin t)/a(1-cos t)=sint/(1-cost)=cot(t/2)d2y/dx^2=d/dt (cot(t/2))*1/dx/dt 为什么要乘1/dx/ Matlab程序：错误在哪里建立函数文件fun5.mfunction dy=fun5(t,y)dy=[(-5*sin(t)*(5*cos(t)-y(1))+5*cos(t)*(5*sin(t)-y(2)))*(5*cos(t)-y(1))./((5*cos(t)-y(1))^2+(5*sin(t)-y(2))^2),(-5*sin(t)*(5*cos(t)-y(1))+5*cos(t)*(5*sin(t)-y(2)))*(5*sin(t)- cos^3+sin^3 求化简设t=cos+sin 设tan(θ/2)=t,求证：sinθ=2t/(1+t^2),cosθ=(1-t^2)/(1+t^2),tanθ=2t/(11t^2)设tan(θ/2)=t,求证：sinθ=2t/(1+t^2),cosθ=(1-t^2)/(1+t^2),tanθ=2t/(1-t^2) 高中数学f(t)=1+Cos(2000*Pi*t)+Sin(4000*Pi*t)f(t)=1+Cos(2000*Pi*t)+Sin(4000*Pi*t) Pi为3.1415926 f(t)的频率【或周期】怎么求啊 cos(cos(t))-cos(sin(t)) 周期怎么求 设α≠kπ2 (k≠0,±1,±2,……),T=sinα+tanαcosα+cotα． 　　A．T取负 值 B．T取非负值 C．T取正值 D．T取值可正可负 求解matlab绘制参数函数y=50*cos(t)-40*cos(t+7.5*((1-cos(3.1415926*t/55))-0.25*(1-cos(2*3.1415926*t/55))+36.86);x=50*sin(t)-40*sin(t+7.5*((1-cos(3.1415926*t/55))-0.25*(1-cos(2*3.1415926*t/55))+36.86);就是绘制这个方程的函数图象,t是 MATLAB 向量相乘的问题已知 t=0:1:20;A=[1,0,0;0,1,0;0,0,1];B=[-sin(t),cos(t),sin(t);-t,t,tan(t);sin(t),cos(t),cos(t)];C=[1,0,1;0,1,0;0,0,1];如何求A*B*C 参数方程:x=1+cosθ*t,y=sinθ*t,求普通方程,