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March 23rd, 2011, 09:56 PM  #1 
Member Joined: Jan 2011 Posts: 40 Thanks: 0  hard Trigonometry prove
Prove that 
March 24th, 2011, 12:46 AM  #2 
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  Re: hard Trigonometry prove
hello dear use induction 

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