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 $\int {\sqrt {1 + \sin \frac{x}{2}} } dx = A\, \sin\, \left( {\frac{x}{4} - \frac{\pi }{4}} \right) + C$ है,तो $A$ का मान ज्ञात कीजिए:

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यदि $\int \frac{x^4+1}{x^2+1} dx = Ax^3 + Bx^2 + Cx + D \tan^{-1} x + E$ है,तो $A+B+C+D=$

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