Posted by **Lucy** on Saturday, April 19, 2008 at 4:03pm.

Which of the following expressions are not equal to 1?

A) sin^2 theta + cot^2 theta sin^2 theta

B) (sin^2 theta/1-cos theta)-cos theta

C) sec^2 theta + tan^2 theta

D) cot^2 theta sin^2 theta/cos^2theta

Answer: D

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