જો $\tan A = \frac{1}{2}$ અને $\tan B = \frac{1}{3}$ હોય,તો $\cos 2A = $

  • A
    $\sin B$
  • B
    $\sin 2B$
  • C
    $\sin 3B$
  • D
    આમાંથી કોઈ નહીં

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જો $\cos \theta = \frac{3}{5}$ અને $\cos \phi = \frac{4}{5}$ હોય,જ્યાં $\theta$ અને $\phi$ ધન લઘુકોણ છે,તો $\cos \frac{\theta - \phi}{2} = $

સાબિત કરો કે $\cos \left(\frac{3 \pi}{4}+x\right)-\cos \left(\frac{3 \pi}{4}-x\right)=-\sqrt{2} \sin x$.

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

$\tan 75^\circ - \cot 75^\circ = $

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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