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प्रश्न
` ∫ {cosec x} / {"cosec x "- cot x} ` dx
योग
उत्तर
` ∫ ( {"cosec "x} / {"cosec x "- cot x} )` dx
\[ = \int\frac{\text{cosec x}\left( \text{cosec x }+ \cot x \right)}{\left(\text{ cosec x} - \cot x \right) \left( \text{cosec x }+ \cot x \right)}dx\]
\[ = \int\frac{\text{cosec x} \left( \text{cosec x }+ \cot x \right)}{\left( {\text{cosec}}^2 x - \cot^2 x \right)}dx\]
\[ = \int\left( {\text{cosec}}^2 x + \text{cosec x } \cot x \right)dx\]
\[ = - \cot x - \text{cosec x }+ C\]
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