$\cos \frac{2\pi}{28} \csc \frac{3\pi}{28} + \cos \frac{6\pi}{28} \csc \frac{9\pi}{28} + \cos \frac{18\pi}{28} \csc \frac{27\pi}{28}$ નું ચોક્કસ મૂલ્ય શું છે?
- A$-1/2$
- B$1/2$
- C$1$
- D$0$
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Similar Questions
જો $\cos \alpha + \cos \beta = a$ અને $\sin \alpha + \sin \beta = b$ હોય,તો List-$A$ માં આપેલી વસ્તુઓને List-$B$ માં તેમના મૂલ્યો સાથે જોડો.
List-$A$ List-$B$ $(I)$ $\tan \left(\frac{\alpha + \beta}{2}\right) =$ $(a)$ $\frac{b}{a}$ $(II)$ $\cos (\alpha + \beta) =$ $(b)$ $\frac{2ab}{a^2 + b^2}$ $(III)$ $\sin (\alpha + \beta) =$ $(c)$ $\frac{2ab}{a^2 - b^2}$ $(IV)$ $\tan (\alpha + \beta) =$ $(d)$ $\frac{a^2 - b^2}{a^2 + b^2}$
| List-$A$ | List-$B$ |
| $(I)$ $\tan \left(\frac{\alpha + \beta}{2}\right) =$ | $(a)$ $\frac{b}{a}$ |
| $(II)$ $\cos (\alpha + \beta) =$ | $(b)$ $\frac{2ab}{a^2 + b^2}$ |
| $(III)$ $\sin (\alpha + \beta) =$ | $(c)$ $\frac{2ab}{a^2 - b^2}$ |
| $(IV)$ $\tan (\alpha + \beta) =$ | $(d)$ $\frac{a^2 - b^2}{a^2 + b^2}$ |
જો $\cot \theta + \tan \theta = 3$ અને $1 - \cos^2 \theta - \alpha \cos \theta = 0$ હોય,તો
જો $\cos \theta = -\frac{\sqrt{3}}{2}$ અને $\sin \alpha = -\frac{3}{5}$ હોય,જ્યાં $\theta$ ત્રીજા ચરણમાં નથી,તો $\frac{2 \tan \alpha + \sqrt{3} \tan \theta}{\cot^2 \theta + \cos \alpha}$ ની કિંમત શોધો.
જો $\sinh x = \frac{12}{5}$ હોય,તો $\sinh 3x + \cosh 3x = $
$\tan 81^{\circ}-\tan 63^{\circ}-\tan 27^{\circ}+\tan 9^{\circ}$ ની કિંમત શોધો.
DifficultAP EAMCET 2014
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