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

question 61

Multiple Choice

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) \(\cos 100 ^ { \circ }\)

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