ધારો કે $\lim _{c \rightarrow 0} \int_c^x \frac{b t \cos 4 t - a \sin 4 t}{t^2} d t = \frac{a \sin 4 x}{x} - 1$. $a$ અને $b$ ની કિંમતો શોધો.

  • A
    $a = 2, b = 2$
  • B
    $a = 1 / 4, b = 1$
  • C
    $a = -1, b = 4$
  • D
    $a = 2, b = 4$

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