A maths問題

Find dy/dx of each of the following functions,where m and n are constants

1.y=√cosx/4
2.y=sin(cosx^3)
3.tanxy=2x^2y^3
Find d^2y/dx^2 of each of the following functions
1.y=1-x/1+x
2.y=sin(2x^2+1)
3.y=x^2cos2x
4.sinx -cosy