Find the Expression as the Sine or Cosine of an Angle.​

question 34

Multiple Choice

Find the expression as the sine or cosine of an angle.​ $$\cos 9 x \cos 5 y + \sin 9 x \sin 5 y$$ ​

• A) \(\sin ( 5 x - 9 y )\)
• B) \(\sin ( 9 x - 5 y )\)
• C) \(\cos ( 5 x - 9 y )\)
• D) \(\cos ( 9 x - 5 y )\)
• E) \(\cos ( 9 x + 5 y )\)

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