sin3x=sin(3∏-3x),当lim x→∏时,3∏-3x→0,则sin(3∏-3x)与3∏-3x是等价无穷小.同理,sin2x= -sin(2∏-2x),当lim x→∏时,2∏-2x→0,则sin(2∏-2x)与2∏-2x是等价无穷小.则原式=lim(x→0) sin(3∏-3x)/(-sin(2∏-2x...