Where are they?

    This is Tommy's bedroom(卧室). You can see a small bed 1the room. There's a toy(玩具)on the bed. You can see a light（灯）on the drawer. 2the photo? It's on the drawer，too. You can see 3on the chair. Where are the plants? They are4. The alarm clock, the pen and a cup 5on the table. 6you see a math book? Yes, it's on the floor. 

如图，BC为⊙O的直径，A为⊙O上的点，以BC、AB为边作▱ABCD，⊙O交AD于点E，连结BE，点P为过点B的⊙O的切线上一点，连结PE，且满足∠PEA=∠ABE．

（1）求证：PB=PE；

（2）若sin∠P=$\frac{3}{5}$，求$\frac{DE}{DC}$的值．