y=cosx(0
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y=cosx(0y=cosx(0y=cosx(0y=cosx(0≦x≦3π/2)与坐标轴所围成的面积是S=[0,π/2]3∫cosxdx=3(sinx)︱[0,π/2]=3或S=[0,π/2]∫cos
y=cosx(0
y=cosx(0
y=cosx(0
y=cosx(0≦x≦3π/2)与坐标轴所围成的面积是
S=[0,π/2]3∫cosxdx=3(sinx)︱[0,π/2]=3
或S=[0,π/2]∫cosxdx+[π/2,3π/2]︱∫cosxdx︱=sinx︱[0,π/2]+︱sinx︱[π/2,3π/2]
=1+︱sin(3π/2)-sin(π/2)︱=1+︱-1-1︱=1+2=3.
1.57 画坐标轴 就出来了啊
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