differential of cos^-1(3x)?

inverse cos 3x
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1 Answer

Let y=cos^-1(3x), then cosy=3x.

Differentiate: -sinydy/dx=3, but siny=sqrt(1-cos^2y),

so dy/dx=-3/sqrt(1-cos^2y)=-3/sqrt(1-9x^2).
by Top Rated User (1.2m points)

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