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:
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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 .
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2. Use Double-angle Formulas to Establish Identities Use a half-angle formula to find the exact value of
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7.5 - 7.5 Double-angle and Half-angle Formulas Double angle...

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