已知函数f(x)=2sin(2x-π/6),x∈R
1.写出函数f(x)的对称轴方程式,对称中心的坐标及单调区间
2.求函数f(x)在区间[0,π/2]上的最大值最小值
人气:498 ℃ 时间:2019-09-10 21:45:09
解答
1.对称轴x=π/3+kπ/2
对称中心(π/12+kπ/2,0)
在(-π/6+kπ/2,π/3+kπ/2)单调递增,在(π/3+kπ/2,5π/6+kπ/2)上单调的减.
2.x=π/3时,max=2;x=0时,min=-1求过程1.对称轴:2x-π/6=π/2+kπ对称中心:2x-π/6=kπy=0递增:-π/2+kπ<2x-π/6<π/2+kπ递减:π/2+kπ<2x-π/6<3π/2+kπ2.因为在(-π/6+kπ/2,π/3+kπ/2)单调递增,即在x=-π/6时取最小值-2,但-π/6不在区间[0,π/2]内,所以在x=0时,有最小值-1;当x=π/3时,取最大值2
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