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

  • A
    $2^{n+1} \cdot \cos ^n\left(\frac{\pi}{4}-\frac{\theta}{2}\right) \cos \left(\frac{n \pi}{4}-\frac{\theta}{2}\right)$
  • B
    $2^{n+1} \cdot \cos ^n\left(\frac{\pi}{4}-\frac{\theta}{2}\right) \cdot \sin \left(\frac{n \pi}{4}-\frac{\theta}{2}\right)$
  • C
    $2^{n+1} \cdot \cos ^n\left(\frac{\pi}{4}-\frac{\theta}{2}\right) \cos \left(\frac{n \pi}{4}-\frac{n \theta}{2}\right)$
  • D
    $2^{n+1} \cdot \cos ^n\left(\frac{\pi}{4}-\frac{\theta}{2}\right) \sin \left(\frac{n \pi}{4}-\frac{n \theta}{2}\right)$

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જો $\cos \alpha + \cos \beta + \cos \gamma = 0$ અને $\sin \alpha + \sin \beta + \sin \gamma = 0$ હોય,તો $\cos 3\alpha + \cos 3\beta + \cos 3\gamma$ ની કિંમત શું થાય?

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જો $\alpha$ અને $\beta$ એ સમીકરણ $x^2+2x+2=0$ ના બીજ હોય,તો $\alpha^{15}+\beta^{15}=$

જો $\omega$ એ એકમનું સંકર ઘનમૂળ હોય,તો $(x+1)(x+\omega)(x-\omega-1)$ ની કિંમત શું થાય?

જો $1, a, a^2, \ldots, a^{n-1}$ એ એકમના $n$ માં મૂળ હોય,તો $\sum_{i=1}^{n-1} \frac{1}{2-a^i}$ ની કિંમત શોધો.

જો $\omega$ એ એકમનું સંકર ઘનમૂળ હોય,તો $\left[\frac{51+73 \omega+87 \omega^2}{73+87 \omega+51 \omega^2}+\frac{51+73 \omega+87 \omega^2}{87+51 \omega+73 \omega^2}\right]^{15}$ ની કિંમત શોધો.

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