Asked by CARL

Prove that:

cos²Θ - sin²Θ = 2cos²Θ - 1

12 years ago

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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