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sin(A-B)/ cosA*cosB =1/x from Tan A - tan B=x

okay !

then ?

cot(A-B) = [ cot A* cot B+1] / ( cot B - cot A)

yes...thanks...I have corrected it later

yes i understood that !

another way @sauravshakya
write the reciprocal f 1st and 2nd equation and add both
then simplify it.

Yep... I would go with that....

okay got it :)
thank you !

:)