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) $\cos ( 9 x + 5 y )$

Question

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) $\cos ( 9 x + 5 y )$

Quizplus · Accepted Answer

The Answer of 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) $\cos ( 9 x + 5 y )$

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

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