For the function j ( x ) = cot ⁡ ( 21 x ) j(x) = \cot(21x) j ( x ) = cot ( 21 x ) , determine the derivative of the inverse function at the point ( 1 , π 84 ) \left(1,\frac{\pi}{84}\right) without calculating the inverse.

For the function j(x)=cot⁡(21x) j(x) = \cot(21x) j(x)=cot(21x),...

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