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OpenStudy (anonymous):
can anyone tell me what dy/dt is of y(t) = 9e^(-0.1t)*cos(3t) ?
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OpenStudy (anonymous):
you'll need to use the product and chain rules for this. dy/dt = \[-0.9e ^{-.1t}\cos(3t)-27\sin(3t)e ^{-.1t}\]
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