Question
Asked Dec 12, 2019
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find the exact value

cos22.5o

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Expert Answer

Step 1

To find the exact value of cos22.5o

Step 2
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1+ cos 0 =±, Half Angle formula: cos

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Step 3

Let

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- 22.5° 2 >0 = 2× 22.5° = 45°

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Calculus

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