S=acsinB/2=2
c*sin45=4
c=4√2
b^2=c^2+a^2-2ac*cosB
=32+1-2*4√2*√2/2
=25
b=5
b/sin45=c/sinC
sinC=c*sin45/b
=4√2*(√2/2)/5
=4/5