$f(x) = (\cos x + i \sin x) \cdot (\cos 3x + i \sin 3x) \cdots [\cos(2n-1)x + i \sin(2n-1)x]$,$n \in N$. તો $f''(x) = ?$ (જ્યાં $i = \sqrt{-1}$)

  • A
    $n^2 f(x)$
  • B
    $-n^4 f(x)$
  • C
    $-n^2 f(x)$
  • D
    $n^4 f(x)$

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Similar Questions

નીચેનામાંથી કયું $\frac{1}{2} + \frac{i\sqrt{3}}{2}$ નું ચતુર્થ મૂળ છે?

જો $z = \frac{-1-i \sqrt{3}}{2}$ હોય,તો $\sum_{k=1}^{2022} \left(z^k + \frac{1}{z^k}\right)^2 = $

જો $1, \omega, \omega^2$ એ એકમના ઘનમૂળ હોય અને $\alpha = \omega + 2\omega^2 - 3$ હોય,તો $\alpha^3 + 12\alpha^2 + 48\alpha + 3$ ની કિંમત શોધો.

જો ${z_1}, {z_2}, {z_3}, ......, {z_n}$ એ એકમના $n$ માં મૂળ (roots of unity) હોય,તો $k = 1, 2, ....., n-1$ માટે:

જો $(\sqrt{3}+i)^8-(\sqrt{3}-i)^8=\alpha+i \beta$ હોય,તો $\alpha-\frac{\sqrt{3}}{2} \beta=$

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