हिंदी

Coseclimx→0cosecx-cotxx is equal to ______.

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प्रश्न

`lim_(x -> 0) ("cosec" x - cot x)/x` is equal to ______.

विकल्प

  • `-1/2`

  • 1

  • `1/2`

  • – 1

MCQ
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उत्तर

`lim_(x -> 0) ("cosec" x - cot x)/x` is equal to `1/2`.

Explanation:

Given `lim_(x -> 0) ("cosec" x - cot x)/x`

= `lim_(x -> 0) (1/sinx - cosx/sinx)/x`

= `lim_(x -> 0) (1 - cos x)/(x sin x)`

= `(2 sin^2  x/2)/(x * 2 sin  x/2 cos  x/2)`  ......`[because  sin 2x = 2 sin x cos x]`

= `lim_(x -> 0) (sin  x/2)/(x cos x/2)`

= `lim_(x -> 0)  (tan  x/2)/x`

= `lim_(x -> 0) (tan  x/2)/(2 xx x/2)`

= `1/2 xx 1`

= `1/2`  ......`[because  lim_(x -> 0)  tanx/2 = 1]`

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अध्याय 13: Limits and Derivatives - Exercise [पृष्ठ २४३]

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एनसीईआरटी एक्झांप्लर Mathematics Exemplar [English] Class 11
अध्याय 13 Limits and Derivatives
Exercise | Q 59 | पृष्ठ २४३

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