જો $f(x) = f(a-x)$ હોય, તો $\int_0^a x f(x) dx$ ની કિંમત શું થાય?

  • A
    $\int_0^a f(x) dx$
  • B
    $\frac{a^2}{2} \int_0^a f(x) dx$
  • C
    $\frac{a}{2} \int_0^a f(x) dx$
  • D
    $-\frac{a}{2} \int_0^a f(x) dx$

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સંકલિત કિંમત $\int_{-2}^{0} [x^3 + 3x^2 + 3x + 3 + (x + 1)\cos(x + 1)] \, dx$ શોધો.

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