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

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

Explore More

Similar Questions

यदि $\omega$ इकाई का एक सम्मिश्र घनमूल है और $x = \omega^2 - \omega + 2$ है,तो:

यदि $\omega$ इकाई का एक सम्मिश्र घनमूल है,तो $\cos \left(\sum_{k=1}^7(k-\omega)(k-\omega^2) \frac{\pi}{175}\right) =$

यदि $n, K \in N$ इस प्रकार हैं कि $n \neq 3K$,तो $(\sqrt{3}+i)^{2n} + (\sqrt{3}-i)^{2n} = $

$n \in Z^{+}$ के लिए,$(1+\sin \theta+i \cos \theta)^n+(1+\sin \theta-i \cos \theta)^n=$

यदि $\left(\frac{\sqrt{3}+i}{\sqrt{3}-i}\right)^m=1$ और $2022 < m < 2029$ है,तो $m=$

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo