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Prove this identify : 2 cos^2 (45°-A ) = 1 +sin 2 A

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Prove this identify : 2 cos^2 (45°-A ) = 1 +sin 2 A...

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Prove this identify : 2 cos^2 (45°-A ) = 1 +sin 2 A​

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Prove this identify : 2 cos^2 (45°-A ) = 1 +sin 2 A