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Simplify the Expression Algebraically cos⁡(6x+9y)+cos⁡(6x−9y)\cos ( 6 x + 9 y ) + \cos ( 6 x - 9 y )

question 15

Multiple Choice

Simplify the expression algebraically.
cos⁡(6x+9y) +cos⁡(6x−9y) \cos ( 6 x + 9 y ) + \cos ( 6 x - 9 y )

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