Consider the following parametric curve. Use the information to answer parts (a) and (b). π x = cost, y = 9 sint; t = - (a) Determine dy dx in terms of t and evaluate it at the given value of t. dy dx Select the correct choice below and, if necessary, fill in the answer box within your choice. OA. The value of 2 OB. The value of OA. dy dx (b) Make a sketch of the curve showing the tangent line at the point corresponding to the given value of t. In each graph below, the dotted line is the tangent line. Choose the correct graph below. O D. dy at t= - is (Simplify your answer.) dx at t= - Q π is undefined. O B. Q O C. Q Ay Q

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