APFIVE Simplifying With Pythagorean Identities
Which of the following is equivalent to $$\frac{1 - \sin^2 x}{\sec^2 x - \tan^2 x}$$ for all values of x for which the expression is defined?
A
$$\tan^2 x$$
B
$$\sin^2 x$$
C
$$1$$
D
$$\cos^2 x$$
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