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OpenStudy (agentjamesbond007):
How do you find the 99th derivative of sinx?
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OpenStudy (anonymous):
Flip flop. 99/2 has a non-zero remainder, so therefore it's cos(x)
OpenStudy (agentjamesbond007):
I thought it alternates every 4; cos, -sin, -cos, sin...
OpenStudy (anonymous):
yes, every 4
OpenStudy (agentjamesbond007):
so 99/4 os 24.75, which means remainder 3; so the answer is -cosx?
hartnn (hartnn):
yup, its -cos x.
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OpenStudy (agentjamesbond007):
oh Thanks!
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