SOLUTION: Find the value of the trigonometric expression. cos 150degrees cos 120 degrees - sin 150 degrees sin 120 degrees

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Question 452834: Find the value of the trigonometric expression. cos 150degrees cos 120 degrees - sin 150 degrees sin 120 degrees
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
cos(150 + 120) = cos 150* cos 120 - sin 150*sin 120 = cos 270 = 0.