设x=2t^2,y=3t^3,则dy/dx=

设x=3e^-t,y=2e^t,则dy/dx等于多少? 设x=e^-t y=e^-2t 求dy/dx 设 {x=2t^3+2 y=e^2t-1 ,求dy/dx,d^2y/dx^2 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+arctan t+1,y=t的立方+6t－2,求dy／dx y= ∫[0,x](t-1)^3(t-2)dt,dy/dx(x=0) 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 设参数方程{x=（2+t^2),y=t.确定了函数y(x).求dy/dx? 设x=lnx,y=t∧3,求dy/dX? 设x=t^2+cost,y=1-sint,求dy/dx 设f(x)连续,Y=∫0~X tf（x^2-t^2）dt 则dy/dx=? 设x=a cos的3次方t y=a sin的3次方t求dy/dx