$\lambda$ ની કઈ કિંમત માટે $\int \frac{4x^3 + \lambda 4^x}{4^x + x^4} \, dx = \log (4^x + x^4) + c$ થાય?

  • A
    $1$
  • B
    $\ln 4$
  • C
    $\log_4 e$
  • D
    $4$

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