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I need to check my answers for parts (a) and (c); a) I got q(t) = p(t)cos(5pit) c) i got y(t) as a rectangle with amplitude 1 from -pi to pi. So, y(t) = 1/8 f(t)

Am I correct for both parts;

http://oi59.tinypic.com/mr3g52.jpg

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(a) looks good to me.

for (c), keep in mind that \$cos x = \frac{e^{ix} + e^{-ix}}2\$, so multiplying with a real valued sine wave will give you mirror images.

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