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Use the Pythagorean Identify to show that the double angle formula for cosine can be written as:

cos2x = 2cos^2x - 1
15 years ago

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Answered by alex
cos2x
8 years ago
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Use the Pythagorean Identify to show that the double angle formula for cosine can be written as:

cos2x = 2cos^2x - 1

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