[tex]\begin{gathered} \tan (90)=\frac{\sin(90)}{\cos(90)} \\ \sin (90)=1 \\ \cos (90)=0 \\ \tan (90)=\frac{1}{0}=\text{ It can not be calculated } \\ also\text{ tan(90) would be }\infty \\ \\ \sin \text{ (120) = ? from the graph} \\ \sin \text{ (120)=}\frac{\sqrt[]{3}}{2} \\ \text{the }\sin \text{ (120) is }\frac{\sqrt[]{3}}{2} \end{gathered}[/tex]
