Question 910765
Which of the following expressions is equivalent to 
(1 - tan^2x)/(tanx + 1)
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Factor the numerator to get:
[(1-tan(x)(1+tan(x)]/[1+tan(x)]
Cancel the common factor to get:
= 1-tan(x)
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Cheers,
Stan H.
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a)1 - tanx
 b)cosx/1 - sinx
 c)sec^2x/1 + sinx
 d)1/sinxcosx