tan(a+b)=-1
(tana+tanb)/(1-tanatanb)=-1
tana+tanb=tanatanb-1
(1-tan a) (1-tan b)
=1-tana-tanb+tanatanb
=1+tanatanb-(tana+tanb)
=1+tanatanb-(tanatanb-1)
=2
a+b=3 π/4,則(1-tan a)(1-tan b)=
a+b=3 π/4,則(1-tan a)(1-tan b)=
數學人氣:276 ℃時間:2020-08-27 00:27:34
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