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Suppose you want to use cos (a-b) = cos a cos b + sin a sin b find the value of cos ( 11 12

Suppose you want to use cos (a-b) = cos a cos b + sin a sin b find the value of cos ( 11 12 ). Identify two angles and that could be used in this formula. You don't need to find the value of the cos ( 11 12 ); you only need to give the two angles and . List the two angles in radians as a reduced fraction.

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