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OpenStudy (anonymous):
how to find 198th derivative f(x) = 3 sinx-2cosx
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myininaya (myininaya):
Have you tried to find the first 6 or 7 derivatives to see if a pattern exist?
OpenStudy (anonymous):
Notice that \[ f^{n}(x) = - f(x) \text { if n is divisible by 2 but not by 4}\\ f^{n}(x) = f(x) \text { if n is divisible by 4}\\ \]
OpenStudy (anonymous):
Your n=198. Examine it and conclude.
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