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March 30, 2015

March 30, 2015

Posted by **Elle** on Thursday, May 9, 2013 at 1:54pm.

1/(tanx-secx) + 1/(tanx+secx) = -2tanx

- Trig -
**Steve**, Thursday, May 9, 2013 at 2:43pmrecall that

(a-b)(a+b) = a^2-b^2

sec^2(x) - 1 = tan^2(x)

put the fractions over a common denominator and watch the answer fall out.

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