if cos(A-B)= 3 cos(A+B) , then CotACotB is
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cosAcosB + sinAsinB=3(cosAcosB-sinAsinB)
cosAcosB+sinBsinA=3cosAcosB-3sinAsinB
2cosAcosB=4sinAsinB
cosAcosB/sinAsinB=4/2
cotAcotB=2
(cosa/ Sina= cotA )
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