$\cos 255^o + \sin 195^o$ નું મૂલ્ય શું છે?

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

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જો $\cos(\alpha + \beta) = \frac{4}{5}$ અને $\sin(\alpha - \beta) = \frac{5}{13}$,જ્યાં $0 \le \alpha, \beta \le \frac{\pi}{4}$ હોય,તો $\tan 2\alpha = $

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