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26-11-2016
Mathematics

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Find the 90 th derivative of the function ƒ(x)=cos(x)

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nobillionaireNobley nobillionaireNobley

29-11-2016

f(x) = cos x
f'(x) = -sin x
f''(x) = -cos x
f'''(x) = sin x
f''''(x) = cos x

90/4 = 22 Remainder 2
Therefore, 90th derivative of f(x) = cos x is -cos x.

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