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sin(π/6%α)=1/3

sin(20°) = 0.34202014332567 http://www.baidu.com/s?ie=utf-8&bs=%E4%B8%BB%E4%BB%BB%E5%AE%B5%E8%A1%A3%E6%97%B0%E9%A3%9F%2C%E5%AE%81%E5%A4%A7%E5%B0%86%E5%AE%89%E4%B9%90%E6%97%B6%E8%80%B6&f=3&rsv_bp=1&wd=%E8%AE%A1%E7%AE%97%E5%99%A8...

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