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January 30th, 2014, 02:11 PM   #1
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Best way to remember Trig formulas?

I'm doing some work right now with product-to-sum/sum-to-product, 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, co-function, 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.

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January 30th, 2014, 04:24 PM   #2
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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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