Find dy/dx:
1. y = x cube(x+1/x-1) raise to the power of 4
2. y = (x squared - 1) divide (x+1) raise to tje power of 3
3. y = x divide square root of x + 1.
4. y = square root of x + 1 divide cube root of x + 1
5. y = square root of (x square - 1)(x+1)