蓝雾迷漫
幼苗
共回答了16个问题采纳率:100% 举报
∫(-π/2,π/2) [sin^6x + x(2-cosx)/(x^4+cosx+10)]dx
=∫(-π/2,π/2) sin^6xdx + ∫(-π/2,π/2) x(2-cosx)/(x^4+cosx+10)dx
=∫(-π/2,π/2) sin^6xdx + 0
=2∫(0,π/2) sin^6xdx
=2·5/6·3/4·1/2·π/2
=5π/16
解题说明:∫(-π/2,π/2)表示以-π/2为下限,π/2为上限的定积分;
积分区间是一个对称区间,x(2-cosx)/(x^4+cosx+10)是一个奇函数,sin^6x是一个偶函数,分别可用对称区间上奇偶函数的积分性质.
1年前
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