જો $\theta \in \left[-\frac{\pi}{2}, \frac{\pi}{2}\right]$ માટે $2 \cos \theta + \sin \theta = 1$ અને $7 \cos \theta + 6 \sin \theta = k$ હોય,તો $k$ ની શક્ય કિંમતો કઈ છે?

  • A
    $8, -2$
  • B
    $6, 2$
  • C
    $12, 4$
  • D
    $7, 6$

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જો સમીકરણ $\cosh x - \frac{4}{5} \sinh x = 1$ નો એક ઉકેલ $x = 0$ હોય,તો બીજો ઉકેલ $x =$ છે.

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