Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of multiple and sub-multiple angles
Easyજો $\cos \theta = \frac{1}{2}\left( a + \frac{1}{a} \right)$ હોય,તો $\cos 3\theta$ ની કિંમત શોધો.
- A$\frac{1}{8}\left( a^3 + \frac{1}{a^3} \right)$
- B$\frac{3}{2}\left( a + \frac{1}{a} \right)$
- C$\frac{1}{2}\left( a^3 + \frac{1}{a^3} \right)$
- D$\frac{1}{3}\left( a^3 + \frac{1}{a^3} \right)$
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Similar Questions
જો $\cos 40^\circ = x$ અને $\cos \theta = 1 - 2x^2$ હોય,તો $0^\circ$ અને $360^\circ$ ની વચ્ચે $\theta$ ના શક્ય મૂલ્યો કયા છે?
Easy
View Solutionજો $\tan \alpha = \frac{-12}{5}$,$\cot \beta = \frac{7}{24}$,$\alpha$ બીજા ચરણમાં નથી અને $\beta$ પ્રથમ ચરણમાં નથી,તો $\sqrt{13} \sin \frac{\alpha}{2} + \cos \frac{\beta}{2} + \tan \frac{\alpha}{2} \cot \frac{\beta}{2} = $
જો $\tan A = \frac{1 - \cos B}{\sin B}$ હોય,તો $\tan B$ ના પદમાં $\tan 2A$ શોધો.
$\cos \frac{\pi }{7} \cos \frac{2\pi }{7} \cos \frac{4\pi }{7} = $
Easy
View Solution$\sin 10^{\circ} \cdot \sin 30^{\circ} \cdot \sin 50^{\circ} \cdot \sin 70^{\circ}$ નું મૂલ્ય શું છે?
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