Question: Maple 11 Assistance

Help!! I have a few questions that I need help with. 1. How do I find dy/dx of a point that I found in a previous problem? 2. Given a function f(x)=(2*x-1)*sin(pi x/2): a. How do I find the value of f ' (3)? b. How do I find the point on the graph of the function that has an x coordinate of 3. c. How do I find an equation for the line tangent to the graph at the point found in part b? I'm stuck and need some assistance, please. Gino
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