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STD 12 - 7.1 inderfinite integral — Mathematics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceMathematicsSTD 12 - 7.1 inderfinite integral1 Mark
MCQ
$\int_{}^{} {\frac{{\cot x\tan x}}{{{{\sec }^2}x - 1}}} \;dx = $
  • A
    $\cot x - x + c$
  • B
    $ - \cot x + x + c$
  • C
    $\cot x + x + c$
  • ✓
    $ - \cot x - x + c$
✓

Answer

Correct option: D.
$ - \cot x - x + c$
d
(d) $\int_{}^{} {\frac{{\cot x\tan x}}{{{{\sec }^2}x - 1}}\,dx = \int_{}^{} {\frac{1}{{{{\tan }^2}x}}\,dx = \int_{}^{} {{{\cot }^2}x\,dx} } } $
$ = \int_{}^{} {(co{\rm{se}}{{\rm{c}}^2}x - 1)\,dx} = - \cot x - x + c.$

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