$x \in R$ के लिए फलन $f(x) = \int\limits_0^1 {t\,\sin \left( {x + \pi t} \right)} dt$ का अधिकतम मान है

  • A
    $\frac{1}{\pi }\sqrt {{\pi ^2} + 4} $
  • B
    $\frac{1}{{{\pi ^2}}}\sqrt {{\pi ^2} + 4} $
  • C
    $\sqrt {{\pi ^2} + 4} $
  • D
    $\frac{1}{{2{\pi ^2}}}\sqrt {{\pi ^2} + 4} $

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$\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}} \sin (x-[x]) \, dx=$

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