08/01/10 04:11:07
>>366
sin(x)
=2sin(x/2)cos(x/2)
=2tan(x/2){cos(x/2)}^2
=2tan(x/2)/[1+{tan(x/2)}^2]
=2t/(1+t^2)
だからプラスのほうだけ
08/01/10 04:11:07
>>366
sin(x)
=2sin(x/2)cos(x/2)
=2tan(x/2){cos(x/2)}^2
=2tan(x/2)/[1+{tan(x/2)}^2]
=2t/(1+t^2)
だからプラスのほうだけ
08/01/10 04:11:07
>>366
sin(x)
=2sin(x/2)cos(x/2)
=2tan(x/2){cos(x/2)}^2
=2tan(x/2)/[1+{tan(x/2)}^2]
=2t/(1+t^2)
だからプラスのほうだけ