What is the derivative of `1/(tan^2x)`
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The derivative of `1/(tan^2x)` has to be determined.
Use the product rule to find the derivative of `cot^2x` .
This gives `2*cot x*(-csc^2x)`
The derivative of `1/(tan^2x)` is` -2*cot x*csc^2x`
the required derivative is -2cotxcosec^2x
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