If cos (A+B)=0 and cot (A-B) =3 Find the value of -1. secA *tanB- cot A.tanB

If cos (A+B)=0 and cot (A-B) =3 Find the value of -1. secA *tanB- cot

1.	If cos (A+B)=0 and cot (A-B) =3 Find the value of -1. secA *tanB- cot A.tanB
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