令a=π-x
則a趨于0
分子=sin(π-a)=sina
分母=π²-2aπ+a²+π²-aπ-2π²=-3aπ+a²
所以原式=limsina/(a²-3aπ)
因為sina~a
所以原式=lima/(a²-3aπ)
=lim1/(a-3π)
=-1/(3π)a→0
lim(x趨向于π)sinx/(x^2+π*x-2*π^2)
lim(x趨向于π)sinx/(x^2+π*x-2*π^2)
數(shù)學人氣:624 ℃時間:2020-02-05 13:07:16
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