APFIVE Pythagorean Identity Transformation
Which expression results from dividing both sides of the Pythagorean identity $$\sin^2\theta + \cos^2\theta = 1$$ by $$\cos^2\theta$$?
A
$$\sec^2\theta - \tan^2\theta = 0$$
B
$$\tan^2\theta + 1 = \csc^2\theta$$
C
$$1 + \tan^2\theta = \sec^2\theta$$
D
$$1 - \tan^2\theta = \sec^2\theta$$
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