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Asked by CARL

Prove that:

cos²Θ - sin²Θ = 2cos²Θ - 1
12 years ago

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Answered by drwls
You should be aware that
sin^2È + cos^2È = 1
Substitute 1 - cos^2È for sin^2È
12 years ago
Answered by CARL
Thank You!!!
12 years ago
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Prove that:

cos²Θ - sin²Θ = 2cos²Θ - 1

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