>>203
lim[x→0](sin2x/(x+tan3x))
=lim[x→0]{(sin2x - 0)/(x-0)}/{(x+tan3x - 0)/(x-0)}
=(1/2)/4
=1/8
かな?

(sin2x - 0)/(x-0)=(1/2)*(sin2x - 0)/(2x-0)
→(1/2)*cos(0)=1/2
(x+tan3x - 0)/(x-0)
→1 + 3/{cos(0)}^2 = 4