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P即x=-√3,y=m 則r=√(3+m²;) 所以sinθ=y/r=m/√(m²;+3)=√2m/4 平方 1/(m²;+3)=1/8 m²;=5 所以cosθ=x/r=-√6/4 tanθ=y/x=±√15/3
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