$\frac{1}{4} [\sqrt{3} \cos 23^\circ - \sin 23^\circ] = $

  • A
    $\cos 43^\circ$
  • B
    $\cos 7^\circ$
  • C
    $\cos 53^\circ$
  • D
    આમાંથી કોઈ નહીં

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ધારો કે $\tan \alpha = \frac{a}{a+1}$ અને $\tan \beta = \frac{1}{2a+1}$, તો $\alpha + \beta$ શું થાય?

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