Guys, I'm having a hard time on understanding the Implicit Differentiation of an equation. Now I'm asking some help to all of you. I will give an equation and KINDLY tell it to me how you got the answer ..Thanks

Assuming that the equation determines a differentiable function f such that y=f(x), find y'

1. 2x^3+x^2y+y^3=1

2.√x+√y=100

3. xy=tan y

Thanks for those who will answer and I would be glad if you can explain to me how you got the answer..