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OpenStudy (linda):
A= 180 B=60. find the exact value of cos(A-B)
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OpenStudy (amistre64):
do you recall the formula for cos(a-b)?
OpenStudy (amistre64):
cos(a-b) = cos(a)cos(b)+sin(a)sin(b)
OpenStudy (amistre64):
cos(180) = -1 sin(180)=0 cos(60) = 1/2 sin(60) = sqrt(3)/2
OpenStudy (amistre64):
the answer is -1/2
OpenStudy (linda):
thank you!
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