Question

Tan A=17/18,.Tan B=1/35 then Cos(A+B)=​

Answer 1

tan A = 18/17 & tan B = 1/35

tan A - tan B = [18/17 - 1/35] = [18 x35 - 17]/(17 x 35) = 630/595

and (1 + tan A.tan B) = 1 + 18/(17 x 35) = [17 x 35 + 18]/(17 x 35)

= 613/595

Now, tan (A - B) = (tan A - tan B)/(1 + tan A.tan

Answer 2

Hope it helps you.

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Thank you!!