यदि $f(a + b - x) = f(x)$ है,तो $\int_a^b x f(x) dx = $

  • A
    $\frac{a + b}{2} \int_a^b f(b - x) dx$
  • B
    $\frac{a + b}{2} \int_a^b f(x) dx$
  • C
    $\frac{b - a}{2} \int_a^b f(x) dx$
  • D
    इनमें से कोई नहीं

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