lim(x→0)arctan(sinx/x)
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lim(x→0)arctan(sinx/x)
lim(x→0)arctan(sinx/x)
lim(x→0)arctan(sinx/x)
原式=arctan[lim(x→0)(sinx/x)]
=arctan1
=π/4
45度啊,Sinx/x就是1。然后arctan1=45度
π/4
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