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March 13th, 2011, 12:18 AM  #1 
Member Joined: Aug 2009 Posts: 69 Thanks: 0  Where can I find some trig practice problems?
I'm in calculus, and I keep getting mixed up on simplifying trig stuff! Where is a website that I can find practice problems ranging from medium to very hard?

March 13th, 2011, 12:25 AM  #2 
Senior Member Joined: Apr 2007 Posts: 2,140 Thanks: 0 
First of all, memorize only the basic trigonometric identities. If you want medium problems, ask me, roadnottaken or MarkFL. If you want very hard problems, ask mattpi or skipjack.

March 13th, 2011, 12:27 AM  #3 
Senior Member Joined: Apr 2007 Posts: 2,140 Thanks: 0  ab ? 0
If cos x + cos y = a and sin x + sin y = b, determine cos (x  y) and cos (x + y) in terms of a and b.


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