જ્યારે $x \in \left( {0, \frac{\pi }{2}} \right)$ હોય,ત્યારે $\frac{x}{2}$ ની સાપેક્ષમાં ${\tan ^{ - 1}}\left( {\frac{{\sin x - \cos x}}{{\sin x + \cos x}}} \right)$ નું વિકલન શું થાય?

  • A
    $2$
  • B
    $\frac{1}{2}$
  • C
    $1$
  • D
    $\frac{2}{3}$

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