यदि $\frac{ax+5}{(x^2+b)(x+3)}=\frac{x+21}{12(x^2+b)}+\frac{c}{12(x+3)}$ है,तो $b^2=$

  • A
    $16$
  • B
    $25$
  • C
    $36$
  • D
    $49$

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यदि $\frac{x^2+5}{(x^2+1)(x-2)}=\frac{A}{x-2}+\frac{Bx+C}{x^2+1}$ है, तो $A+B+C=$

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