First have to decide you want to differentiate with respect to which variable. In this case since we need the gradient of tangent (dy/dx) we differentiate with respect to (wrt) x. Implicit differentiation just have to differentiate terms with Y as per normal like you would with X terms but must multiply with dy/dx to all the differentiated Y terms. There are videos on YouTube by Khan Academy you can check them out also. Do you need the parametric question? That’s not really implicit differentiation already.