Find the derivative of the given function. 9) = 5 cosz(6) f'(6) = 5 sin(20) / Determine all 9 in [7r/2, 7r/2] at which the graph has horizontal tangents. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) a: X Recall that (cos 6)' = sin 9 and (sin 6)' = cos 9. Also recall that the graph of f(6) has a horizontal tangent wherever f'(9) = 0. How can the product rule be used to nd the derivative of the given function? When is cos 9 = 0? When is sin 6 = 0? Submit Answer Find the derivative of the function y defined implicitly in terms of x. x+y+4x2+3y3: Ex: dX Submil Answer Find the tangent line to the cun/e (x y)2 = xy 1 at the given point. (a) (2' 5) (b) (2, 1) Submit Answer 2 2 Consider the curve given by 1%L $%47L : 1. Determine the point(s) on the curve where the tangent line to the curve is vertical. (Enter your answers as a comma-separated list of points.)