解析
tan4π=tan2π=0
∴tan(4排-a)
=(tan4π-tana)/(1+tan4πtana)
=(-tana)/1
=-tana
果斷打字
tan(4派-a)=
tan(4派-a)=
其他人氣:272 ℃時間:2020-10-01 19:49:23
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