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  3. verify the identity cos 7x 7y cos 7x 7y 2 cos 7x c

Verify the identity cos 7x 7y cos 7x 7y 2 cos 7x cos 7y cos...

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Calculus

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Verify the identity cos 7x 7y cos 7x 7y 2 cos 7x cos 7y cos 7x 7y cos 7x 7y cos 7x cos 7y 63 13 sin 7x sin 7y

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