જો $\tanh ^2 x = \tan ^2 \theta$ હોય,તો $\cosh 2x =$

  • A
    $\cos \theta$
  • B
    $\sin \theta$
  • C
    $\cos 2\theta$
  • D
    $\sec 2\theta$

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$\cos \frac{2\pi}{28} \csc \frac{3\pi}{28} + \cos \frac{6\pi}{28} \csc \frac{9\pi}{28} + \cos \frac{18\pi}{28} \csc \frac{27\pi}{28}$ નું ચોક્કસ મૂલ્ય શું છે?

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સમીકરણો $\sin x + \sin y = \sin (x + y)$ અને $|x| + |y| = 1$ નું સમાધાન કરતી $(x, y)$ જોડીઓની સંખ્યા કેટલી છે?

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