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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

$\cos^2 x$

B

$1$

C

$\tan^2 x$

D

$\sin^2 x$

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Rank	User	Correct Count	Attempt Count	Total Time	Score
#1	mihikadarbha	2	2	0m 43s	157
#2	ywlee000000	1	1	0m 10s	90
#3	gultepemesut	1	1	0m 20s	80
#4	hekim4066	1	1	0m 23s	77
#5	raffigaribian	1	1	0m 29s	71
#6	ethan185183	1	1	0m 38s	62
#7	vaibhav.vemuri	1	2	0m 50s	40
#8	mayazaabalawi10	1	1	1m 10s	30
#9	thomsonming26	1	1	1m 26s	14
#10	chunxiangxu.cxu	1	2	1m 25s	5

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