यदि $f^{\prime}(x)=a \sin x+b \cos x$,$f^{\prime}(0)=4$,$f(0)=3$ और $f\left(\frac{\pi}{2}\right)=5$ है,तो $f(x)=$

  • 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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यदि $g\left(\frac{t+1}{2 t+1}\right)=t+1$ है,तो $\int g(x) d x=$

$\int \frac{\cos 2x - 1}{\cos 2x + 1} dx = $

$\int \frac{d x}{\sqrt{5+4 x-x^{2}}}=$

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