$\lim _{x \rightarrow 0} \frac{\cos 2x - \cos 3x}{\cos 4x - \cos 5x} = $

  • A
    $\frac{5}{9}$
  • B
    $1$
  • C
    $\frac{3}{4}$
  • D
    $\frac{2}{5}$

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$\mathop {\lim }\limits_{x \to {0^ + }} {x^m}{(\log x)^n}$,જ્યાં $m, n \in N$ હોય,તેની કિંમત શું થાય?

Difficult
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ધારો કે $[x]$ એ $x$ થી નાનો અથવા તેના જેટલો મહત્તમ પૂર્ણાંક દર્શાવે છે અને $k \geq 2$ એ પૂર્ણાંક છે. તો $\lim_{x \rightarrow k} \frac{\sin \left(2 \pi\left([x]-\left[\frac{x}{k}\right]\right)-x\right)+\sin k}{x-k} = $

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