Tangent of A+B+C and tanA+ or - TanB

 Fomula of tangent of angles

\[tan \left (A+B+C \right)=\frac{ tanA+tanB+tanC-tanA tanB tanC}{1-tanB tanC- tanCtanA-tanA tanB} \]

\[tan \left (A+B \right )= \frac{Sin (A+B)}{CosA CosB} \]

\[tan \left (A-B \right )= \frac{Sin (A-B)}{CosA CosB} \]

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