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The value of $\int_{π / 4}^{π / 2} \cot θ {cosec}^{2} θ d θ$ is

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Correct option is B

∫π/4π/2 cot⁡θcosec2⁡θdθ=−∫10 udu (u=cot⁡θ)=∫01 udu=u2201=12

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The value of ∫π/4π/2 cot⁡θcosec2⁡θdθ is

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The value of $\int_{π / 4}^{π / 2} \cot θ {cosec}^{2} θ d θ$ is