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What is the derivative of 5cos^2(pi)(t)? ...?
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What is the derivative of 5cos^2(pi)(t)? ...?

User Joel Wietelmann
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1 Answer

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the answer is
we know that (cosu(t))' = -u '(t) sin u(t)
so (cos^2(pi)(t)) ' = 2 (-pi sin pit) cospit
and finally the answer is
[5cos^2(pi)(t)] ' = -10 pi sin pit cospit
User Prprcupofcoffee
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