sin cos tan数值表 是以角度(数学上最常用弧度
从a画一条平分线与bc相较于e,那么三角形abe和三角形ace之间ab=ac,ae
a b c =2r sin a sin b sin c 分三种
正弦定理 a b c 2r sin a sin b sin c 1 s ab sin c
ρcos(α 45°)=1 ρ(cosαcos45°-sinαsin45°)=1 根号2/2x-根号2
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