角a的终边过点p(x,-3),则OP=根号(x^2+9)
cosa=x/OP=x/根号(x^2+9)=x/4
那么x=0或x^2=7
(1)x=0,OP=3,sina=y/OP=-3/3=-1
(2)x^2=7,OP=4,那么sina=y/OP=-3/4