3. (10 points) Suppose that x2 = cot y Use implicit differentiation to show that - dy 2.r(1 + cscy) 1 + cscy dx csc y (Hint: cot y = csc2 y - 1.) day y2 - 2xy 4. (10 points) Suppose that 2xy - y2 = 3. Use implicit differentiation to show that dx2 (y - )3