谁能直接告我tan18°，cos18°，sin18°的值。不需要推导过程
sin²18\u00b0+cos²18\u00b0= \u7ed9\u51fa\u8fc7\u7a0b\u7b2c\u4e00\u6b65\u662f\u5206\u5b50\u5206\u6bcd\u540c\u65f6\u4e58\u4ee5 2cos18' \u7136\u540e\u4f7f\u75282\u500d\u89d2\u516c\u5f0f\u4e5f\u5c31\u662f 2sin18'cos18'=sin36'
\u6700\u540e\u518d\u6b21\u4f7f\u75282\u500d\u89d2\u516c\u5f0f 2sin36'cos36'=sin72'=cos18' \u6700\u540e\u518d\u7ea6\u5206\u4e00\u4e0b\u5c31\u662f 1/4
cos18°=0.951
tan18°=0.3249
分别是0.32492 0.951057 0.309017
绛旓細sin18掳=0.309 cos18掳=0.951 tan18掳=0.3249
绛旓細鍥炵瓟锛歴in30. 1/2
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