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OpenStudy (anonymous):
sin (A+B)/sin(A-B)=cot A + cot B/cot A - cot B. Show this is an identity.
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OpenStudy (anonymous):
sinAcosB + cosAsinB / sinAcosB - cosAsinB
OpenStudy (anonymous):
is that the left side of the equal side?
OpenStudy (anonymous):
left side
OpenStudy (anonymous):
put a - sign in the denominator
OpenStudy (anonymous):
.
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