求函数y=3sin(π/4-2x)的单调增区间并确定其值域。
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因为y=sinx的单调增区间为[-π/2+2kπ,π/2+2kπ]k属于整数,,-π-4kπ<=-2x<=π-4kπ
,-π-4kπ+π/4<=-2x+π/4<=π-4kπ+π/4,,-3π/4-4kπ<=-2x+π/4<=-4kπ+5π/4,k属于整数
y=3sin(π/4-2x)的单调增区间为
[-3π/4-4kπ,-4kπ+5π/4],k属于整数
-1<=sin(π/4-2x)<=1,所以-3<=3sin(π/4-2x)<=3
所以值域为[-3,3]
希望对你有帮助
,-π-4kπ+π/4<=-2x+π/4<=π-4kπ+π/4,,-3π/4-4kπ<=-2x+π/4<=-4kπ+5π/4,k属于整数
y=3sin(π/4-2x)的单调增区间为
[-3π/4-4kπ,-4kπ+5π/4],k属于整数
-1<=sin(π/4-2x)<=1,所以-3<=3sin(π/4-2x)<=3
所以值域为[-3,3]
希望对你有帮助
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