Originally posted by 紅唇娃 at 2005-2-20 01:12:
圖2, 3, 4 有冇得影大張少少?
Originally posted by 紅唇娃 at 2005-2-20 01:27:
英國D數真係冇香港好 :P
冇條識做
(死逃~)
Originally posted by oscar at 2005-2-20 02:45:
Originally posted by SusanCrystal at 2005-2-20 05:15 AM:
θ+φ=π/4
tan(θ+φ)=1
(tanθ+tanφ)/(1-tanθtanφ)=1
tanθ+tanφ=1-tanθtanφ
tanθ+tanθtanφ+tanφ=1
tanθ+tanφ(tanθ+1)=1
tanφ(tanθ+1)=1-tanθ
tanφ=(1-tanθ)/(1+tanθ)
1+tanφ=(1+tanθ)/(1+tanθ) + (1-tanθ)/(1+tanθ)
1+tanφ=2/(1+tanθ)
(1+tanθ)(1+tanφ)=2
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