ધારો કે $f(x)$ એ વિકલનીય વિધેય છે જેથી $f(0)=0$ અને $f^{\prime}(0)=20$ થાય. $x \in \left(0, \frac{\pi}{2}\right]$ માટે,જો $A(x)=2 f(x) \operatorname{cosec} 4 x+4 f(x)\left(\cos ^2 x+1\right)-4 \cos ^2 x$ હોય,તો $\lim _{x \rightarrow 0} A(x)=$

  • A
    $0$
  • B
    $4$
  • C
    $6$
  • D
    $8$

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