matlab反正弦 pi到pi,为什么正弦，反正弦函数计算结果会出现复数？

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All_1=62.9582, lAdot_radS=(180/186)/180*pi;

onedeg = pi/180;

RAAN = onedeg:onedeg*10:(pi-onedeg);

RAAN = 0:onedeg*5:pi;

betaA = acos(cos(epsin)*cos(inc)+sin(epsin)*sin(inc)*cos(RAAN))

betaA0 = betaA*180/pi;

x_sunsyn = sin(All_1/180*pi)./sin(betaA);

x_sunsyn= 2*asin(x_sunsyn)/lAdot_radS

为什么算出来的结果会有复数？

x_sunsyn =

1.0e+002 *

Columns 1 through 5

1.3874 1.3863 1.3829 1.3775 1.3705

Columns 6 through 10

1.3621 1.3529 1.3434 1.3339 1.3250

Columns 11 through 15

1.3170 1.3103 1.3053 1.3021 1.3011

Columns 16 through 20

1.3026 1.3067 1.3137 1.3237 1.3371

Columns 21 through 25

1.3541 1.3750 1.4002 1.4300 1.4653

Columns 26 through 30

1.5069 1.5567 1.6182 1.7024 1.8600 - 0.0899i

Columns 31 through 35

1.8600 - 0.1983i 1.8600 - 0.2607i 1.8600 - 0.3050i 1.8600 - 0.3371i 1.8600 - 0.3591i

Columns 36 through 37

1.8600 - 0.3721i 1.8600 - 0.3763i