Consider the following:\(1.{\rm{\;}}\frac{{{\rm{cos}}75^\circ }}{{{\rm{sin}}15^\circ }} + \frac{{{\rm{sin}}12^\circ }}{{{\rm{cos}}78^\circ }} - \frac{{{\rm{cos}}18^\circ }}{{{\rm{sin}}72^\circ }}{\rm{\;}} = {\rm{\;}}1\)\(2.\;\frac{{{\rm{cos}}35^\circ }}{{{\rm{sin}}55^\circ }} - \frac{{{\rm{sin}}11^\circ }}{{{\rm{cos}}79^\circ }} + {\rm{cos}}28^\circ .{\rm{cosec}}62^\circ {\rm{\;}} = {\rm{\;}}1\)\(3.\;\frac{{{\rm{sin}}80^\circ }}{{{\rm{cos}}10^\circ }} - {\rm{sin}}59^\circ .{\rm{sec}}31^\circ {\rm{\;}} = {\rm{\;}}0\)Which of the above are correct?

• A. 1 and 2 only
• B. 2 and 3 only
• C. 1 and 3 only
• D. 1, 2 and 3