SOLUTION: prove identity using proper form (1/1-secx)+(1/1+secx)=-2cot^2x

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Question 667668: prove identity using proper form
(1/1-secx)+(1/1+secx)=-2cot^2x
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
%281%2F%281-secx%29%29%2B%281%2F%281%2Bsecx%29%29=-2cot%5E2x

LCD = (1-secx)(1+secx)
%281%2Bsecx%2B1-secx%29%2F%28%281%2Bsecx%29%281-secx%29%29

2%2F%281-sec%5E2x%29
2/(-tan^2x)
-2cot%5E2x
hence proved