In Problems 2130, use Half-angle Formulas to find the exact value of each expression. cos 22.5
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In Problems 21–30, use Half-angle Formulas to find the exact value of each expression.
cos 22.5°
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To find the exact value of cos 225 using the halfangle formula well use the formul...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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