$\cos \left(\frac{7 \pi}{12}\right)$ નું મૂલ્ય શું છે?

  • A
    $\frac{\sqrt{2}+\sqrt{3}}{4}$
  • B
    $\frac{\sqrt{2}-\sqrt{3}}{4}$
  • C
    $\frac{\sqrt{2}-\sqrt{6}}{4}$
  • D
    $\frac{\sqrt{6}-\sqrt{2}}{4}$

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$\cos \alpha \sin (\beta-\gamma) + \cos \beta \sin (\gamma-\alpha) + \cos \gamma \sin (\alpha-\beta)$ ની કિંમત શું થાય?

જો $m \cos (\alpha+\beta)-n \cos (\alpha-\beta)=m \cos (\alpha-\beta)+n \cos (\alpha+\beta)$ હોય,તો $\tan \alpha \tan \beta=$

સાબિત કરો કે $\frac{\tan (\frac{\pi}{4}+x)}{\tan (\frac{\pi}{4}-x)} = (\frac{1+\tan x}{1-\tan x})^{2}$.

સાબિત કરો કે: $\sin x + \sin 3x + \sin 5x + \sin 7x = 4 \cos x \cos 2x \sin 4x$

જો બે ખૂણાઓ $\alpha, \beta$ એવા હોય કે $0 < \alpha, \beta < \frac{\pi}{4}$,$\sqrt{1+\cos 2 \alpha}=\frac{3}{\sqrt{5}}$ અને $\frac{\sqrt{1-\cos 2 \beta}}{\sqrt{1+\cos 2 \beta}}=\frac{1}{7}$,તો $(2 \alpha+\beta)=$

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