cos(3π/4) /sin(3π/4)等于
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cos(3π/4)=cos(π-π/4)=-cosπ/4=-√2/2
sin(3π/4)=sin(π-π/4)=sinπ/4=√2/2
cos(3π/4) /sin(3π/4)
=(-√2/2)/(√2/2)
=-1
sin(3π/4)=sin(π-π/4)=sinπ/4=√2/2
cos(3π/4) /sin(3π/4)
=(-√2/2)/(√2/2)
=-1
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