यदि $f(x)=3 x^{15}-5 x^{10}+7 x^5+50 \cos (x-1)$ है,तो $\lim _{h \rightarrow 0} \frac{f(1-h)-f(1)}{h^3+3 h}=$

  • A
    -$25$
  • B
    $25$
  • C
    -$10$
  • D
    $10$

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$\lim _{x \rightarrow \pi / 2}(\sec x-\tan x)$ का मान ज्ञात कीजिए।

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यदि $f^{\prime \prime}(0)=k, k \neq 0,$ है, तो $\lim _{x \rightarrow 0} \frac{2 f(x)-3 f(2 x)+f(4 x)}{x^{2}}$ का मान क्या है?

$\operatorname{Lim}_{x \rightarrow 0} \frac{e-(1+2 x)^{\frac{1}{2 x}}}{x}$ का मान ज्ञात कीजिए :

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