Question: 13. Simplify the expression algebraically. sin (7x+7y) + sin (7x-7y) sin 7x cos 7y O sin (7x-7y2) O 2sin 7x cos 7y 2 sin

13. Simplify the expression algebraically. sin (7x+7y) + sin (7x-7y) sin 7x

13. Simplify the expression algebraically. sin (7x+7y) + sin (7x-7y) sin 7x cos 7y O sin (7x-7y2) O 2sin 7x cos 7y 2 sin 7x Osin (7x+7y2)

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