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STD 12 - 5. continuity and differentiation — Mathematics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceMathematicsSTD 12 - 5. continuity and differentiation1 Mark
MCQ
${d \over {dx}}\left[ {\log \sqrt {{{1 - \cos x} \over {1 + \cos x}}} } \right] = $
  • A
    $\sec x$
  • ✓
    $cosec\,x$
  • C
    $cosec{x \over 2}$
  • D
    $\sec {x \over 2}$
✓

Answer

Correct option: B.
$cosec\,x$
b
(b) $\frac{d}{{dx}}\left[ {\log \sqrt {\frac{{1 - \cos x}}{{1 + \cos x}}} } \right] = \frac{d}{{dx}}\left[ {\log \left( {\tan \frac{x}{2}} \right)} \right] = {\rm{cosec}}\,x$.

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