જો $\tan \left(\frac{x}{2}\right) = \frac{m}{n}$ હોય,તો $m \sin (x) + n \cos (x)$ ની કિંમત કેટલી થાય?

  • A
    $m$
  • B
    $-m$
  • C
    $-n$
  • D
    $n$

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જો $x \in \left(-\frac{\pi}{2}, \frac{\pi}{2}\right)$ હોય,તો $\log \sec x = $

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