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

  • A
    $\frac{19}{12}$
  • B
    $\frac{56}{33}$
  • C
    $\frac{25}{16}$
  • D
    $\frac{20}{7}$

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સાબિત કરો કે $\sin^{2} 6x - \sin^{2} 4x = \sin 2x \sin 10x$.

જો $\cos \alpha + \cos \beta = \frac{1}{3}$ અને $\sin \alpha + \sin \beta = \frac{1}{4}$ હોય,તો $\cos (\alpha + \beta) = $

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