અનંત શ્રેણી $1 + 2 + \frac{1}{2!} + \frac{2}{3!} + \frac{1}{4!} + \frac{2}{5!} + \dots$ નો સરવાળો કેટલો થાય?

  • A
    $e^2$
  • B
    $e + e^{-1}$
  • C
    $\frac{e - e^{-1}}{2}$
  • D
    $\frac{3e - e^{-1}}{2}$

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ધારો કે $C(\theta) = \sum_{n=0}^{\infty} \frac{\cos(n\theta)}{n!}$. નીચેનામાંથી કયું વિધાન ખોટું છે?

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