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OpenStudy (anonymous):
cos(a-b)=cosacosb+sinasinb for all values of a and b true or false.
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OpenStudy (shamim):
true
OpenStudy (ash2326):
\[\cos (A-B)=\cos A \cos B+\sin A \sin B\] This is a trigonometric identity, it's true for all values.
OpenStudy (anonymous):
Thanks @shamim and @ash2326
OpenStudy (shamim):
welcome
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