જો $\tan \alpha = \frac{x^2 - x}{x^2 - x + 1}$ અને $\tan \beta = \frac{1}{2x^2 - 2x + 1}$ $(x \ne 0, 1)$,જ્યાં $0 < \alpha, \beta < \frac{\pi}{2}$ હોય,તો $\tan(\alpha + \beta)$ ની કિંમત કેટલી થાય?

  • A
    $1$
  • B
    $-1$
  • C
    $2$
  • D
    $\frac{3}{4}$

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$\tan 81^{\circ}-\tan 63^{\circ}-\tan 27^{\circ}+\tan 9^{\circ}$ ની કિંમત શોધો.

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