1. Find dy/dx (do not simplify the answer): y = In (cos (x+ 1)) 2. Find dy/dx given that sin(xy)=x+4y, 3. A. Given the following sign-chart of y = f'(x), with f'(x) = 0 at x = a, b, and c. Draw y = f(x) (over the sign chart) and label the corresponding points on the graph at a, b and c. y=f'(x): B. Given the following sign-chart of y = f "(x), with f "(x) = 0 at x= a, b, and c. Draw y = f(x) (over the sign chart) and label the corresponding points on the graph at a, b and c. y=f"(x): 4. Sketch the graph y=x4-2x+3. Find its extrema and inflection points, if any. Indicate where it' increasing decreasing concave up and concave down