यदि $f^{\prime}(x)=k(\cos x+\sin x)$ और $f(0)=9, f\left(\frac{\pi}{2}\right)=15$ है,तो $f(x)=$

  • A
    $3(\sin x-\cos x)+12$
  • B
    $3(\sin x-\cos x)-12$
  • C
    $3(\sin x+\cos x)+12$
  • D
    $3(\cos x+\sin x)-12$

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