(2006•北京模拟)已知limx→0
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(2006•北京模拟)已知
lim |
x→0 |
因为0=
lim
x→0
sin6x−f(x)tanx
x3=
lim
x→0(
sin6x−6tanx
x3+
6tanx−f(x)tanx
x3),
并且当x→0时,tanx~x,
所以,
lim
x→0
6−f(x)
x2
=
lim
x→0
6tanx−f(x)tanx
x3
=
lim
x→0
6tanx−sin6x
x3
=
lim
x→0
6sec2x−6cos6x
3x2
=2
lim
x→0
(sec2x−1)+(1−cos6x)
x2
=2[
lim
x→0
sin2x
x2cos2x+
lim
x→0
1
2(6x)2
x2]
=2×[1+18]
=38.
lim
x→0
sin6x−f(x)tanx
x3=
lim
x→0(
sin6x−6tanx
x3+
6tanx−f(x)tanx
x3),
并且当x→0时,tanx~x,
所以,
lim
x→0
6−f(x)
x2
=
lim
x→0
6tanx−f(x)tanx
x3
=
lim
x→0
6tanx−sin6x
x3
=
lim
x→0
6sec2x−6cos6x
3x2
=2
lim
x→0
(sec2x−1)+(1−cos6x)
x2
=2[
lim
x→0
sin2x
x2cos2x+
lim
x→0
1
2(6x)2
x2]
=2×[1+18]
=38.
(2014•北京模拟)已知函数f(x)=sin2x+3sinxcosx−12.
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