Mathematics
Senior High
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なぜx<0になるのでしょうか？
0s
222. 【関数の極限と大小関係】
sinx
X→-0
x
例題31 三角関数の極限
*08
しUS 0 1
SII
1
222.(1) x<0 のとき, -1ハsinx<1 より,
s Sinx<-uf (x)<h(x)=
1
-ハ-
x
af(x)<h(x)s
x
x
a*=0
lim f(x)=lir
1
x→a
x-
ここで、lim
x→-8 X
-=, lim (--)=0 であるから,
x→-0
ならば, lim
x→a
sinx
=D0
(はさみうち。
ates
lim
X→-0
x
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