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#1 Help Me ! » Trignonmetry: proving identities » 2009-10-22 11:19:58

jaycm610
Replies: 1

Hey guys! I'm new on this forum. I'm 17, and I need some help with Trig if i'm gonna graduate.

Here's this problem. I need to prove this identity. I worked on this problem for an hour, and have no clue what to do.
   
cosx- (cosx/1-tanx) = sinxcosx/sinx-cosx

Thanks in advance.

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