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

question 58

Multiple Choice

Simplify the expression algebraically.​ $$\cos ( 7 x + 4 y ) \cos ( 7 x - 4 y )$$ ​

• A) \(\cos ^ { 2 } 7 x - \sin ^ { 2 } y\)
• B) \(\cos ^ { 2 } 7 x + \sin ^ { 2 } 4 y\)
• C) \(\cos ^ { 2 } 7 x - \sin ^ { 2 } 4 y\)
• D) \(\cos ^ { 2 } x - \sin ^ { 2 } 4 y\)
• E) \(\cos ^ { 2 } x - \sin ^ { 2 } y\)

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