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OpenStudy (anonymous):
cos(A-B)=2sinAsinB
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OpenStudy (anonymous):
you want the proof???
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
your question is incomplete check it out
OpenStudy (anonymous):
it's just like it was written. and A+b=90
OpenStudy (anonymous):
actualy the identity is cos(A - B) - cos(A + B) = 2sinAsinB
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OpenStudy (anonymous):
wow thanks man that soleved it
OpenStudy (anonymous):
welcome
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