读日本简图，回答问题
She is a girl. What's ______ name?
—Why did you quarrel with your mum?—She was always _________ a little guy.
已知：∠1=30°30′，∠2=28.5°，则sin（∠1﹣∠2）≈____ （可用计算器，精确到0.001）
