6、 设{x=sint ; y=cos2t ,则dy/dx｜t-(x/4) A -2√￣2 B -√￣2 C √￣2 D

设x=1+t^2、y=cost 求 dy/dx 和d^2y/dx^2 sint-tcost/4t^3 和 sint-tc 设x=t^2+cost,y=1-sint,求dy/dx x=2t^2 +1 y= sint 求dy/dx是多少? 设y=√(x^2-1)求dy/dx 参数方程：x=5(t-sint) y=5(1-cost) 求d^2y/dx^2 dy/dx我会求 设｛x=ln√（1+t^2),y=arctant,求 dy/dx及d^2·y/d·x^2 x=(e^t)sint y=(e^t)cost 求d^2y/dx^2 参数方程 导数问题x=a(t-sint) y=b(1-cost) d求 dy/dx 主要是 dy/dt 和dx/dt怎么 求参数方程所确定的函数的导数dy/dx.大括号里面x=sint,y=cos2t 设y=2arctany/x,求dy/dx,dy^2/d^2x. 设函数y=y(x)由x=1-e^t和y=t+e^-t确定,求dy/dx和d^2y/dx^2 y=[sin(x^4)]^2,则dy/dx=?,dy^2/dx^2=?,dy/d(x^2)=?