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Use a sum-to-product identity to rewrite the expression. sin 5a + sin 8a sin 5a +...

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Use a sum-to-product identity to rewrite the expression. sin 5a + sin 8a sin 5a + sin 8a= (Use integers or fractions for any
Use a sum-to-product identity to rewrite the expression. sin 5a + sin 8a sin 5a + sin 8a= (Use integers or fractions for any numbers in the expression.) Enter your answer in the answer box

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