Find the derivative of tan-1(x). If you use the identity 1 + tan2(x) = sec2(x), you can

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Find the derivative of tan-1(x). If you use the identity 1 + tan2(x) = sec2(x), you can write the answer without any trigonometric functions
We can use Theorem 2.13 to find the derivatives of the inverse trigonometric functions.
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