જો $f^{\prime}(x)=a \sin x+b \cos x$,$f^{\prime}(0)=4$,$f(0)=3$ અને $f\left(\frac{\pi}{2}\right)=5$ હોય,તો $f(x)=$

  • A
    $-2 \cos x-4 \sin x+1$
  • B
    $2 \cos x+4 \sin x+1$
  • C
    $2 \sin x-4 \cos x+1$
  • D
    $2 \sin x+4 \cos x+1$

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નિરીક્ષણની રીત દ્વારા વિધેય $\cos 3x$ નું પ્રતિ-વિકલિત (અથવા સંકલિત) શોધો.

$\int \frac{x \, dx}{x^2 + 4x + 5} = $

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