33. If $a + \beta = \pi / 2$ and $\beta + \gamma = a$, then tan $a$ equals:
(A) $2 ( \tan \beta + \tan \gamma )$
(B) $\tan \beta + \tan \gamma$
(C) $\tan \beta + 2 \tan \gamma$
(D) $2 \tan \beta + \tan \gamma$
33. If $a + \beta = \pi / 2$ and $\beta + \gamma = a$, then tan $a$ equals:\\
(A) $2 ( \tan \beta + \tan \gamma )$\\
(B) $\tan \beta + \tan \gamma$\\
(C) $\tan \beta + 2 \tan \gamma$\\
(D) $2 \tan \beta + \tan \gamma$\\