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tan(A − B) = (tan A − tan B)/ 1 + tan A tan B

consider A=60,B=10

A+B=70;A-B=50

thus we get the entire equation interms of tan(60) and tan(10)

tan(A+B)*tan(A-B)=((tan A)^2 --(tan B)^2)/1-(tan(A)*tan (B))^2