$\int \limits_0^1 \cos (\pi x) \cos ([2 x] \pi) d x$ का मान क्या है? (यहाँ $[t]$ वास्तविक संख्या $t$ के महत्तम पूर्णांक फलन को दर्शाता है।)

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

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