MCQ
${\tan ^{ - 1}}\frac{{a - b}}{{1 + ab}} + {\tan ^{ - 1}}\frac{{b - c}}{{1 + bc}} = $
- A${\tan ^{ - 1}}a - {\tan ^{ - 1}}b$
- ✓${\tan ^{ - 1}}a - {\tan ^{ - 1}}c$
- C${\tan ^{ - 1}}b - {\tan ^{ - 1}}c$
- D${\tan ^{ - 1}}c - {\tan ^{ - 1}}a$
$ = {\tan ^{ - 1}}(a) - {\tan ^{ - 1}}(b) + {\tan ^{ - 1}}(b) - {\tan ^{ - 1}}(c)$
$ = {\tan ^{ - 1}}(a) - {\tan ^{ - 1}}(c)$.
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