\(0^\circ < {\rm{\Theta }} < 90^\circ .{\rm{Then\;}}\frac{{cot{\rm{\Theta }} - 1}}{{1 - tan{\rm{\Theta }}}} \div \left( {\frac{{sin{\rm{\Theta }}}}{{1 + cos{\rm{\Theta }}}} + \frac{{1 + cos{\rm{\Theta }}}}{{sin{\rm{\Theta }}}}} \right)\) కు సమానమైనది:
1
\(\frac{{cos{\rm{\Theta }}}}{2}\)
2
\(\frac{{sec{\rm{\Theta }}}}{2}\)
3
\(cos{\rm{\Theta }}\)
4
\(sin{\rm{\Theta }}\)