SOLUTION: Use an addition or subtraction formula to write the expression as a trigonometric function of one number, and then find its exact value.
cos(30)cos(60)- sin(30)sin(60)
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Question 434030: Use an addition or subtraction formula to write the expression as a trigonometric function of one number, and then find its exact value.
cos(30)cos(60)- sin(30)sin(60)
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
cos(30)cos(60)- sin(30)sin(60) = cos(30 + 60) = cos(90) = 0
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