$\tan 3A - \tan 2A - \tan A = $
$\tan 3A - \tan 2A - \tan A = $
- A
$\tan 3A\tan 2A\tan A$
- B
$ - \tan 3A\tan 2A\tan A$
- C
$\tan A\tan 2A - \tan 2A\tan 3A - \tan 3A\tan A$
- D
None of these
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- [IIT 1966]
If $\tan x = \frac{b}{a},$ then $\sqrt {\frac{{a + b}}{{a - b}}} + \sqrt {\frac{{a - b}}{{a + b}}} = $
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If $sin t + cos t = \frac{1}{5}$ then $tan \frac{t}{2}$ is equal to :
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