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Express the given sum or difference as a product of sines and/or cosines. cos 50 + cos 70 cos 50 + cos 70 = (Simplify

Express the given sum or difference as a product of sines and/or cosines. cos 50 + cos 70 cos 50 + cos 70 = (Simplify your answer, including any radicals. Use integers or fractions for any nu

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