Find the expression as the sine or cosine of an angle.
$\cos 100 ^ { \circ } \cos 60 ^ { \circ } - \sin 100 ^ { \circ } \sin 60 ^ { \circ }$
A) $\cos 40 ^ { \circ }$
B) $\sin 40 ^ { \circ }$
C) $\sin 160 ^ { \circ }$
D) $\cos 160 ^ { \circ }$
E) $\cos 100 ^ { \circ }$

Question

Find the expression as the sine or cosine of an angle. 
 $\cos 100 ^ { \circ } \cos 60 ^ { \circ } - \sin 100 ^ { \circ } \sin 60 ^ { \circ }$  
A) $\cos 40 ^ { \circ }$
B) $\sin 40 ^ { \circ }$
C) $\sin 160 ^ { \circ }$
D) $\cos 160 ^ { \circ }$
E) $\cos 100 ^ { \circ }$

Quizplus · Accepted Answer

The Answer of Find the expression as the sine or cosine of an angle. 
 $\cos 100 ^ { \circ } \cos 60 ^ { \circ } - \sin 100 ^ { \circ } \sin 60 ^ { \circ }$  
A) $\cos 40 ^ { \circ }$
B) $\sin 40 ^ { \circ }$
C) $\sin 160 ^ { \circ }$
D) $\cos 160 ^ { \circ }$
E) $\cos 100 ^ { \circ }$

Find the Expression as the Sine or Cosine of an Angle