Pythagorean Identity Transformation

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Which expression results from dividing both sides of the Pythagorean identity $\sin^2\theta + \cos^2\theta = 1$ by $\cos^2\theta$ ?

$\sec^2\theta - \tan^2\theta = 0$

$1 + \tan^2\theta = \sec^2\theta$

$1 - \tan^2\theta = \sec^2\theta$

$\tan^2\theta + 1 = \csc^2\theta$

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