勾的题 求详解
1个回答
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(3)
lim x²cos(1/x)/sin2x
x→0
=lim x²cos(1/x)/(2x)
x→0
=lim ½xcos(1/x)
x→0
=0
(6)
lim ln(1-2x)/sin5x
x→0
=lim (-2x)/(5x)
x→0
=-2/5
(7)
lim (tanx-sinx)/sin³x
x→0
=lim tanx(1-cosx)/sin³x
x→0
=lim x·½x²/x³
x→0
=lim ½x³/x³
x→0
=½
(8)
lim sin2x·(eˣ-1)/tanx²
x→0
=lim 2x·x/x²
x→0
=lim 2x²/x²
x→0
=2
lim x²cos(1/x)/sin2x
x→0
=lim x²cos(1/x)/(2x)
x→0
=lim ½xcos(1/x)
x→0
=0
(6)
lim ln(1-2x)/sin5x
x→0
=lim (-2x)/(5x)
x→0
=-2/5
(7)
lim (tanx-sinx)/sin³x
x→0
=lim tanx(1-cosx)/sin³x
x→0
=lim x·½x²/x³
x→0
=lim ½x³/x³
x→0
=½
(8)
lim sin2x·(eˣ-1)/tanx²
x→0
=lim 2x·x/x²
x→0
=lim 2x²/x²
x→0
=2
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