November 6th, 2011, 09:43 AM  #1 
Guest Joined: Posts: n/a Thanks:  Trig identities
1. Prove: 1) 2) and 2. If prove that 
November 6th, 2011, 02:47 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,847 Thanks: 1568 
2. You need to know that the angles are in the first quadrant, so that and so that It follows that 
November 6th, 2011, 04:49 PM  #3  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Re: urgent help Hello, noki! Quote: [color=beige]. . [/color] [color=beige]. . [/color] [color=beige]. . [/color] Quote: [color=beige]. . [/color] [color=beige]. . [/color] Quote: [color=beige]. . [/color] [color=beige]. . [/color] Quote:
 
November 7th, 2011, 12:41 AM  #4 
Guest Joined: Posts: n/a Thanks:  Re: urgent help
Woow! thanks a lot. 

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