Calculate cos(a+b) if tana=1/2 , tanb=1/3 and it is given that tan(a+b)= tana+tanb . 1-tana tanb
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from values of tan a and tan b, find tan(a+b) by using the given equation.
let a+b = x
now you know tanx so you can find cosx by using sec^2 x = 1 + tan^2 x
let a+b = x
now you know tanx so you can find cosx by using sec^2 x = 1 + tan^2 x
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