+22 Find DB in the diagram below
[asy]
size(250);
pair A,B,C,D;
A=origin;
B=(4,0);
C=3dir(30);
D=(2.3,0);
draw(C--A--B--C--D);
dot("$A$",A,SW);
dot("$B$",B,SE);
dot("$C$",C,N);
dot("$D$",D,S);
label("$2$",A--D,S);
label("$30^\circ$",A,6dir(15));
label("$45^\circ$",B,4dir(158));
label("$60^\circ$",C,5dir(-75));
[/asy]
