$\cos 105^\circ + \sin 105^\circ$ નું મૂલ્ય શું છે?

  • A
    $\frac{1}{2}$
  • B
    $1$
  • C
    $\sqrt{2}$
  • D
    $\frac{1}{\sqrt{2}}$

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ધારો કે $\cos(\alpha+\beta)=-\frac{1}{10}$ અને $\sin(\alpha-\beta)=\frac{3}{8}$ જ્યાં $0 < \alpha < \frac{\pi}{3}$ અને $0 < \beta < \frac{\pi}{4}$. જો $\tan 2\alpha=\frac{3(1-r\sqrt{5})}{\sqrt{11}(s+\sqrt{5})}$, જ્યાં $r, s \in N$, તો $r+s$ ની કિંમત . . . . . . થાય.

$\tan 15^\circ = $

સાબિત કરો કે $\frac{\sin x+\sin 3x}{\cos x+\cos 3x} = \tan 2x$.

$\frac{\sin \theta + \sin 3 \theta}{\cos \theta + \cos 3 \theta}$ નું મૂલ્ય શું છે?

જો $2 \sin \left(\theta+\frac{\pi}{3}\right)=\cos \left(\theta-\frac{\pi}{6}\right)$ હોય,તો $\tan \theta$ ની કિંમત શોધો.

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