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sin20度=對邊除以斜邊 tan20度=對邊除以鄰邊 斜邊=(鄰邊的平方+對邊的平方)的平方根 當tan20度=0.364時 把對邊看作0.364,鄰邊看作1 則sin20度=0.364/√(0.364^2+1^2) =0.342
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