急！数学函数问题
已知f(x)=sin(2x-派分之6）＋二分之一1.求f(x)的单调递减区间2.求f(x)在区间[0,3分之2派]上的取值范围...
已知f(x)=sin(2x-派分之6）＋二分之一 1. 求f(x)的单调递减区间 2 . 求f(x)在区间[0,3分之2派]上的取值范围
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f(x)=sin(2x-π/6）+1/2
2kπ+π/2<=2x-π/6<=2kπ+3π/2
2kπ+2π/3<=2x<=2kπ+5π/3
kπ+π/3<=x<=kπ+5π/6,k是整数
2.0<=x<=2π/3
-π/6<=2x-π/6<=7π/6
-1/2<=sin(2x-π/6)<=1
-1/2<=f(x)<=1
2kπ+π/2<=2x-π/6<=2kπ+3π/2
2kπ+2π/3<=2x<=2kπ+5π/3
kπ+π/3<=x<=kπ+5π/6,k是整数
2.0<=x<=2π/3
-π/6<=2x-π/6<=7π/6
-1/2<=sin(2x-π/6)<=1
-1/2<=f(x)<=1
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