in triangle abc a=12 b=16 and sinB=2/3 what is the measure of angle A in degrees还有:the equation x^2+2ix-4=0 has as its toota根号下5-1,-根号下5-1b根号下5-i,根号下5+ic根号下3-i,根号下5+id根号下3-i,根号下3+ie根号下3-1,-
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