Simplify the Expression Algebraically $$\sin ( 9 x + 9 y ) \sin ( 9 x - 9 y )$$

question 18

Multiple Choice

Simplify the expression algebraically.​ $$\sin ( 9 x + 9 y ) \sin ( 9 x - 9 y )$$ ​

• A) \(\sin ^ { 2 } x - \sin ^ { 2 } 9 y\)
• B) \(\sin ^ { 2 } 9 x + \sin ^ { 2 } 9 y\)
• C) \(\sin ^ { 2 } 9 x - \sin ^ { 2 } 9 y\)
• D) \(\sin ^ { 2 } x + \sin ^ { 2 } y\)
• E) \(\sin ^ { 2 } 9 x - \sin ^ { 2 } y\)

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