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Simplify the Expression Algebraically cos⁡(7x+4y)cos⁡(7x−4y)\cos ( 7 x + 4 y ) \cos ( 7 x - 4 y )

question 73

Multiple Choice

Simplify the expression algebraically.
cos⁡(7x+4y) cos⁡(7x−4y) \cos ( 7 x + 4 y ) \cos ( 7 x - 4 y )

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