求证:∠CAB=∠AED.
∴EA=EB.
∴∠EAB=∠B.
∵∠C=90°,
∴∠CAB+∠B=90°.
又∵∠AED+∠EAB=90°,
∴∠CAB=∠AED
—I'm going to visit the zoo.