x=e^2t .cost y=e^t .sint 当t=兀/6时dy/dx的值
x=(e^t)sint y=(e^t)cost 求d^2y/dx^2
x=2t+cost y=t+e^t 求dy/dx
验证参数方程{x=e^t*sint y=e^t*cost 所确定的函数满足关系式(d^2y/dx^2)*(x+y)^2=
设x=t^2+cost,y=1-sint,求dy/dx
已知x=e的t次方sint和y=e的t次方cost,求当t等于三分之π时,y的导数是多少?
已知 x = e^t * cos t y = e^t *sin t 求当t= π/3时dy/dx的值
设x=1+t^2、y=cost 求 dy/dx 和d^2y/dx^2 sint-tcost/4t^3 和 sint-tc
已知﹛x=7(t-sint),y=7(1-cost),则dy/dx=
求微分的题目一道,x=e^(-t)sint,y=e^tcost,求 d^2y/dx^2
设x=e^-t y=e^-2t 求dy/dx
设x=3e^-t,y=2e^t,则dy/dx等于多少?
用Mathematica求常微分方程组的解 dx/dt +y=cost dy/dt+x=sint 求命令与结果T-T