$\int_0^{2/3} \frac{dx}{4 + 9x^2} = $

  • A
    $\frac{\pi}{12}$
  • B
    $\frac{\pi}{24}$
  • C
    $\frac{\pi}{4}$
  • D
    $0$

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ધારો કે $f$ એ ધન વાસ્તવિક અક્ષ પર વ્યાખ્યાયિત વાસ્તવિક મૂલ્ય ધરાવતું સતત વિધેય છે,જેથી $g(x) = \int_0^x t f(t) dt$ થાય. જો $g(x^3) = x^6 + x^7$ હોય,તો $\sum_{r=1}^{15} f(r^3)$ નું મૂલ્ય શોધો:

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