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In order to simplify cos (7 + a ) + cos(7 - a ) using the compound angle formula(s), your first step would be: O

In order to simplify cos (7 + a ) + cos(7 - a ) using the compound angle formula(s), your first step would be: O - cos x - COS a Ocos(JT + act - 2) Ocostcos x - singsin x + costcos x + singsin x O-2 cos x

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