∵∠CDA+∠ADE=∠EDB+∠ADE=90°
∴∠CDA=∠EDB
∵∠CAD+∠DAB=∠DBA+∠DAB=90°
∴∠CAD=∠DBA
∴△CAD~△EBD
∴CA/EB=AD/DB
∵∠α=30°
∴AD/DB=√3
∵CA=2
∴EB=2√3/3
∵∠CDA+∠ADE=∠EDB+∠ADE=90°
∴∠CDA=∠EDB
∵∠CAD+∠DAB=∠DBA+∠DAB=90°
∴∠CAD=∠DBA
∴△CAD~△EBD
∴CA/EB=AD/DB
∵∠α=30°
∴AD/DB=√3
∵CA=2
∴EB=2√3/3