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OpenStudy (anonymous):
Please help True or false Cosxcosy=1/2(sin(x+y)+sin(x-y))
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OpenStudy (anonymous):
@jim_thompson5910
OpenStudy (anonymous):
@perl
jimthompson5910 (jim_thompson5910):
check out these trig identities http://www.sosmath.com/trig/Trig5/trig5/trig5.html look under the section "Product-to-Sum Formulas"
OpenStudy (anonymous):
It's true right
OpenStudy (anonymous):
Thanks
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OpenStudy (anonymous):
I mean false
jimthompson5910 (jim_thompson5910):
which one?
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