求定積分∫1?1f(x)dx,其中f(x)=sinx?1 (x≤0)x2 (x>0).
優(yōu)質(zhì)解答
f(x)dx=
(sinx-1)dx+
x
2dx
=(-cosx-x)
+
x3=cos1-2+
=cos1-
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