# 7.5 - 7.5 Double-angle and Half-angle Formulas Double angle...

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7.5 Double-angle and Half-angle Formulas Double –angle Formulas:

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Half –angle Formulas:
1. Use Double-angle Formulas to Find Exact Values 2 cos 5  3 2   sin 2 cos2

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If tan 4 and lies in quadrant III, find sin 2 , cos2 , and tan 2 .
2. Use Double-angle Formulas to Establish Identities Use a half-angle formula to find the exact value of

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## This note was uploaded on 01/16/2012 for the course MATH 127 taught by Professor Blisinhestiyas during the Fall '11 term at Truckee Meadows Community College.

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7.5 - 7.5 Double-angle and Half-angle Formulas Double angle...

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