જો $2f(\sin x) + f(\cos x) = x$ હોય,તો $\frac{d}{dx} f(x)$ શું થાય?

  • A
    $x + 1$
  • B
    $2$
  • C
    $\frac{1}{\sqrt{1 - x^2}}$
  • D
    આમાંથી કોઈ નહીં

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