20) Find the derivative of cos (1x)
options:
-(sin x)/27
(sin/x) /21
(Cos x)/21
(cos x)/21x
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Cos x)/21
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Derivative of cos x
The Derivative of y = cos -1x: The derivative of cos-1x is: (The derivation is essentially the same as for sin -1x.) A graph of y = cos-1x and its derivative is shown at right. Notice that since cos-1x is a strictly-decreasing function, its derivative is always negative.
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