ધારો કે $\theta_1$ અને $\theta_2$ એવા છે કે જેથી $(\theta_1-\theta_2)$ એ $3^{\text{rd}}$ અથવા $4^{\text{th}}$ ચરણમાં આવે છે. જો $\sin \theta_1+\sin \theta_2=-\frac{21}{65}$ અને $\cos \theta_1+\cos \theta_2=-\frac{27}{65}$ હોય,તો $\cos \left(\frac{\theta_1-\theta_2}{2}\right)=$

  • A
    $\frac{3}{\sqrt{150}}$
  • B
    $\frac{3}{\sqrt{130}}$
  • C
    $-\frac{3}{\sqrt{130}}$
  • D
    $-\frac{3}{\sqrt{150}}$

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સાબિત કરો કે: $\frac{(\sin 7x + \sin 5x) + (\sin 9x + \sin 3x)}{(\cos 7x + \cos 5x) + (\cos 9x + \cos 3x)} = \tan 6x$

કિંમત શોધો: $\sin (\beta + \gamma - \alpha ) + \sin (\gamma + \alpha - \beta ) + \sin (\alpha + \beta - \gamma ) - \sin (\alpha + \beta + \gamma )$

જો $A=35^{\circ}, B=15^{\circ}$ અને $C=40^{\circ}$ હોય,તો $\tan A \cdot \tan B+\tan B \cdot \tan C+\tan C \cdot \tan A$ ની કિંમત શોધો.

જો $\cos (\alpha + \beta) = \frac{3}{5}$,$\sin (\alpha - \beta) = \frac{5}{13}$ અને $0 < \alpha, \beta < \frac{\pi}{4}$ હોય,તો $\tan (2\alpha)$ ની કિંમત શોધો.

$\frac{\tan 70^o - \tan 20^o}{\tan 50^o}$ ની કિંમત શોધો.

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