MCQ
$\frac{1}{2}{\cos ^{ - 1}}\left( {\frac{{1 - x}}{{1 + x}}} \right) = $
- A${\cot ^{ - 1}}\sqrt x $
- ✓${\tan ^{ - 1}}\sqrt x $
- C${\tan ^{ - 1}}x$
- D${\cot ^{ - 1}}x$
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$( S_{1})$: $2|\hat{ a } \times \hat{ b }|=|\hat{ a }-\hat{ b }|$ અને
$(S_{2})$ : $\hat{a}$ ના $(\hat{a}+\hat{b})$ પરના પ્રક્ષેપનું માન $\frac{1}{2}$ છે