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Find the Expression as the Sine or Cosine of an Angle

Question 8

Short Answer

Find the expression as the sine or cosine of an angle.
​ cos⁡100∘cos⁡50∘−sin⁡100∘sin⁡50∘\cos 100 ^ { \circ } \cos 50 ^ { \circ } - \sin 100 ^ { \circ } \sin 50 ^ { \circ } ​

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