lim(1-X*X/2)的1/sinX*sinX次方(X趋向0)
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lim(1-X*X/2)的1/sinX*sinX次方(X趋向0)lim(1-X*X/2)的1/sinX*sinX次方(X趋向0)lim(1-X*X/2)的1/sinX*sinX次方(X趋向0)lim(
lim(1-X*X/2)的1/sinX*sinX次方(X趋向0)
lim(1-X*X/2)的1/sinX*sinX次方(X趋向0)
lim(1-X*X/2)的1/sinX*sinX次方(X趋向0)
lim(1-X*X/2)的1/sinX*sinX次方(X趋向0)
=lim(x--->0)(1-1/2*x^2)^((sinx)^2)
=lim(x--->0)(e^(ln(1-1/2*x^2)/(sinx)^2)
=e^(lim(x--->0)(ln(1-1/2*x^2)/(sinx)^2
x--->0时,sinx--->x
=e^(lim(x--->0)(ln(1-1/2*x^2)/x^2)
=e^(lim(x--->0)((-x/(1-1/2*x^2))/2x)
=e^(lim(x--->0)(-1/(2-x^2))
=e^(-1/2)
支持楼上
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