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OpenStudy (anonymous):
Use the addition formulas for sine and cosine to simplify the expression. cos(6u)cos(7u)+sin(6u)sin(7u)
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myininaya (myininaya):
cos(7u-6u)=cos(1u)=cos(u)
OpenStudy (anonymous):
what happen to sin?
myininaya (myininaya):
you know that cos(x-y)=cosxcosy-sinxsiny right?
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