If tanA ­ tanB = X, then the value of X is

If tanA ­ tanB = X, then the value of X is
1). $\frac{(tanA + tanB)}{(1 - tanAtanB)}$
2). $\frac{(tanA + tanB)}{(1 + tanAtanB)}$
3). $\frac{(tanA - tanB)}{(1 - tanAtanB)}$
4). $\frac{(tanA - tanB)}{(1 + tanAtanB)}$

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