lim(π-x)tan(x/2)(x趋向于π)

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lim(π-x)tan(x/2)(x趋向于π)lim(π-x)tan(x/2)(x趋向于π)lim(π-x)tan(x/2)(x趋向于π)lim(π-x)tan(x/2)(x趋向于π)=lim(π-x

lim(π-x)tan(x/2)(x趋向于π)
lim(π-x)tan(x/2)(x趋向于π)

lim(π-x)tan(x/2)(x趋向于π)
lim(π-x)tan(x/2)(x趋向于π)
=lim(π-x)sin(x/2)/cos(x/2)
=lim(π-x)/[sin(π-x)/2]*limsin(x/2)
=2*1=2