could any one help me solving this parametric equation.

1, if y=cos^3 t and x=sin^3t calculate d^2 y/dx^2

2,the parametric equation of a function are given as x=3sin2t and y= 1-e^cos2t calculate dy/dx and d^2 y/dx^2

3, partial differetiation- determine d^2 z/dxdy if z=3xy^2+5x^2 y^4-y^5

4, if v=2loge^(4y-3x) calculate d^2 v/dxdy

5,if u=e^-x(xcosy) determine the value of

i,du/dx

ii,d^2 u/dydx