यदि $f(x) = \begin{cases} 4x + 3, & 1 \le x \le 2 \\ 3x + 5, & 2 < x \le 4 \end{cases}$ है,तो $\int_1^4 f(x) \, dx = $

  • A
    $80$
  • B
    $20$
  • C
    $-20$
  • D
    $37$

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$\int_0^1 \sqrt{\frac{1-x}{1+x}} \, dx =$

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यदि $g(x) = \int_{0}^{x} \cos 4t \, dt$ है,तो $g(x + \pi) = $

यदि $u(n) = \int_0^{\frac{\pi}{2}} (1 + \sin t)^n \sin 2t \, dt$,जहाँ $n \in N$,तो $u(4) = $

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