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 degrees)cos(60 degrees)-sin(30

Algebra ->  Trigonometry-basics -> 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 degrees)cos(60 degrees)-sin(30       Log On


   

Question 516407: Use an addition or subtraction formula to write the expression as a trigonometric function of one number, and then find its exact value.
+cos%2830+degrees%29cos%2860+degrees%29-sin%2830+degrees%29sin%2860+degrees%29
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
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 degrees)cos(60 degrees)-sin(30 degrees)sin(60 degrees)
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= cos(30+60) = cos(90) = 0
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Cheers,
Stan H.