用五点法画函数y=1-sin2x x属于【π/2,5π/2】的图像 并求出最大值及最小值时x的取值

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2013-06-26
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2x π/2 π 3π/2 2π 5π/2
x π /4 π /2 3π/4 π 5π/4
y 1-√2/2 0 2 1 0
最大值:2及最小值:0时x的取值
x=3π/2 ,
x=π ,5π/2
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最大值2 最小值0 y最小时x等于5/4π 9/4π
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