જો $f(a + b - x) = f(x)$ હોય,તો $\int_{a}^{b} x f(x) dx$ ની કિંમત શું થાય?

  • A
    $\frac{a+b}{2} \int_{a}^{b} f(b-x) dx$
  • B
    $\frac{a+b}{2} \int_{a}^{b} f(b+x) dx$
  • C
    $\frac{a+b}{2} \int_{a}^{b} f(x) dx$
  • D
    $\frac{b-a}{2} \int_{a}^{b} f(x) dx$

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જો $\int_0^\pi {xf(\sin x)dx = A} \int_0^{\pi /2} {f(\sin x)dx} $ હોય,તો $A$ ની કિંમત શું થાય?

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