16. The value of $$\frac{{\cot {{30}^ \circ } - \cot {{75}^ \circ }}}{{\tan {{15}^ \circ } - \tan {{60}^ \circ }}}$$ is?
17. If $${\text{se}}{{\text{c}}^2}\theta + {\text{ta}}{{\text{n}}^2}\theta = \frac{7}{{12}}{\text{,}}$$ then $${\text{se}}{{\text{c}}^4}\theta $$ - $${\text{ta}}{{\text{n}}^4}\theta $$ = ?
18. The numerical value of $$\frac{5}{{{\text{se}}{{\text{c}}^2}\theta }}$$ + $$\frac{2}{{1 + {\text{co}}{{\text{t}}^2}\theta }}$$ + $${\text{3}}{\sin ^2}\theta $$ is?
19. The numerical value of $$\left( {\frac{1}{{\cos \theta }} + \frac{1}{{\cot \theta }}} \right)$$ $$\left( {\frac{1}{{\cos \theta }} - \frac{1}{{\cot \theta }}} \right)$$ is?
20. The value of cos1° cos2° cos3° ............. cos177° cos178° cos179° is?
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