In Problems 2128 use sum, difference, product, or half-angle formulas to find the exact value of each
Question:
In Problems 21–28 use sum, difference, product, or half-angle formulas to find the exact value of each expression.
cos65°cos20° + sin65°sin20°
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To find the exact value of the expression cos65cos20 sin65sin20 we can use the sumtopro...View the full answer
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Related Book For 
Precalculus Concepts Through Functions A Unit Circle Approach To Trigonometry
ISBN: 9780137945139
5th Edition
Authors: Michael Sullivan
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