$\frac{(\cos \alpha + i\sin \alpha )^4}{(\sin \beta + i\cos \beta )^5} = $

  • A
    $\cos (4\alpha + 5\beta ) + i\sin (4\alpha + 5\beta )$
  • B
    $\cos (4\alpha + 5\beta ) - i\sin (4\alpha + 5\beta )$
  • C
    $\sin (4\alpha + 5\beta ) - i\cos (4\alpha + 5\beta )$
  • D
    આમાંથી કોઈ નહીં

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જો $\alpha$ એ $z^2-z+1=0$ નું બીજ હોય,તો $\left(\alpha^{2014}+\frac{1}{\alpha^{2014}}\right)+\left(\alpha^{2015}+\frac{1}{\alpha^{2015}}\right)^2+\left(\alpha^{2016}+\frac{1}{\alpha^{2016}}\right)^3+\left(\alpha^{2017}+\frac{1}{\alpha^{2017}}\right)^4+\left(\alpha^{2018}+\frac{1}{\alpha^{2018}}\right)^5=$

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જો $2+2 \sqrt{3} i=k(\cos \theta+i \sin \theta)$ જ્યાં $k > 0$ હોય,તો $\frac{1}{\sqrt{3}}[\cos 6 \theta+i \sin 6 \theta]$ ની કિંમત શોધો.

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