Asked by mohamed sedeeq
cos^4 15-sin^4 15 with out using calculator
Answers
Answered by
bobpursley
I wonder if you have learned the power reduction formulas...
Power-reduction formulas see http://en.wikipedia.org/wiki/List_of_trigonometric_identities
Power-reduction formulas see http://en.wikipedia.org/wiki/List_of_trigonometric_identities
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