જો $\cos \theta = \frac{8}{17}$ અને $\theta$ એ $1^{st}$ ચરણમાં હોય,તો $\cos (30^\circ + \theta) + \cos (45^\circ - \theta) + \cos (120^\circ - \theta)$ ની કિંમત શોધો.

  • A
    $\frac{23}{17} \left( \frac{\sqrt{3} - 1}{2} + \frac{1}{\sqrt{2}} \right)$
  • B
    $\frac{23}{17} \left( \frac{\sqrt{3} + 1}{2} + \frac{1}{\sqrt{2}} \right)$
  • C
    $\frac{23}{17} \left( \frac{\sqrt{3} - 1}{2} - \frac{1}{\sqrt{2}} \right)$
  • D
    $\frac{23}{17} \left( \frac{\sqrt{3} + 1}{2} - \frac{1}{\sqrt{2}} \right)$

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$\frac{\sin 3\theta + \sin 5\theta + \sin 7\theta + \sin 9\theta}{\cos 3\theta + \cos 5\theta + \cos 7\theta + \cos 9\theta} = $

$\sin \left(\frac{5 \pi}{24}\right) \cdot \cos \left(\frac{\pi}{24}\right)$ નું મૂલ્ય શું છે?

જો $\theta$ અને $\phi$ એ $1^{st}$ ચરણમાં આવેલા ખૂણાઓ હોય કે જેથી $\tan \theta = 1/7$ અને $\sin \phi = 1/\sqrt{10}$ હોય,તો:

સાબિત કરો કે $\sin (n+1) x \sin (n+2) x + \cos (n+1) x \cos (n+2) x = \cos x$.

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