Sin,cos,tan的0,30,45,60,90度分别是多少.?各值的参数如下表格：tan90°=无穷大 （因为sin90°=1 ，cos90°=0 ，1/0无穷大 ）；cot0°=无穷大也是同理。扩展资料关于sin的定理：正弦函数的定.
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