જો $[.]$ એ મહત્તમ પૂર્ણાંક વિધેય દર્શાવતું હોય,તો $\int_{0}^{\sqrt{\pi / 2}}\left(\left[ x ^{2}\right]+[-\cos x ]\right) d x$ ની કિંમત ............. છે.

  • A
    $0$
  • B
    $1$
  • C
    $-1$
  • D
    $-1 - \sqrt{\frac{\pi}{2}}$

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