$\int_0^{\pi /2} {\left( {\frac{\theta }{{\sin \theta }}} \right)^2 d\theta = } $

  • A
    $\pi \log 2$
  • B
    $\frac{\pi }{{\log 2}}$
  • C
    $\pi $
  • D
    इनमें से कोई नहीं

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यदि $\int \frac{a \cos x-2 \sin x}{b \sin x+5 \cos x} d x=\frac{7}{41} x+\frac{22}{41} \log |b \sin x+5 \cos x|+C, (a>0, b>0)$, तो $\int \frac{d x}{b+a \cos x}=$

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