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If tanA=-1/2 and tanB=-1/3 then A+B=...

If `tanA=-1/2` and `tanB=-1/3` then `A+B=`

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`tanA=-1/2,tanB=-1/3`
`tan(A+B)=(tanA+tanB)/(1-tanAtanB)`
`tan(A+B)=((-1/2)+(-1/3))/(1-(-1/2)(-1/3))`
`tan(A+B)=((-1/2)(-1/3))/(1-1/6)`
`A+B=tan^(-1)(-1)=-pi/4`
`A+B=-pi/4`.
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