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Asked by mohamed sedeeq

cos^4 15-sin^4 15 with out using calculator
13 years ago

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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
13 years ago
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cos^4 15-sin^4 15 with out using calculator

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