मान लीजिए कि $f:R \to R$ और $g:R \to R$ सतत फलन हैं,तो समाकलन $\int_{-\pi/2}^{\pi/2} [f(x) + f(-x)][g(x) - g(-x)] \, dx$ का मान क्या होगा?

  • A
    $ \pi $
  • B
    $ 1 $
  • C
    $ -1 $
  • D
    $ 0 $

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