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January 30th, 2014, 02:11 PM  #1 
Member Joined: Oct 2013 Posts: 38 Thanks: 2  Best way to remember Trig formulas?
I'm doing some work right now with producttosum/sumtoproduct, double angle, and addition/subtraction formulas. I keep having to reference the book, because I can't remember them all. For what it's worth, I'm great with remembering the reciprocal, Pythagorean, cofunction, and even/odd identities. I'm in a very condensed, fast paced winter class, and the formulas will not be given to us on the test. Thanks. 
January 30th, 2014, 04:24 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,622 Thanks: 2076 
Try learning the formulas for sin(A + B), cos(A + B) and tan(A + B) first, as the rest of the formulas are easily proved from them.


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