[tex]\begin{gathered} \text{If we rotate a point (x,y) by a degree of }\theta\text{ , the new point have coodinates} \\ (x\cdot\cos (\theta)-y\cdot\sin (\theta),x\cdot\sin (\theta)+y\cdot\cos (\theta)) \end{gathered}[/tex][tex]\begin{gathered} And\text{ , having in account that} \\ \cos (90º)=0,\sin (90º)=1, \\ \text{ The rotation of a point (x,y) by a degr}e\text{ of }\theta\text{ is} \\ (-y,x) \end{gathered}[/tex][tex]\begin{gathered} So,\text{ If E' is the rotation of E, and similary with J, R and S, } \\ E^{\prime}=(2,2) \\ J^{\prime}=(-2,1) \\ R=(-3,3) \\ S=(-2,5) \\ \\ \end{gathered}[/tex]
