现场呼救.,最好写下纸上拍照发过来.【给好评】.
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/28 22:20:34
现场呼救.,最好写下纸上拍照发过来.【给好评】.
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(1)
T=2π/2=π
f(π/8)=3cos(2π/8+π/4)=3cos(π/2)=0
(2)
单调增区间:
由-π+2kπ≤2x+π/4≤2kπ得:
-3π/8+kπ≤x≤-π/8+kπ
原函数的单调增区间是;[-3π/8+kπ ,-π/8+kπ]
由2kπ≤2x+π/4≤π+2kπ得:
-π/8+kπ≤x≤3π/8+kπ
原函数的单调增区间是;[-π/8+kπ ,3π/8+kπ]
T=2π/2=π
f(π/8)=3cos(2π/8+π/4)=3cos(π/2)=0
(2)
单调增区间:
由-π+2kπ≤2x+π/4≤2kπ得:
-3π/8+kπ≤x≤-π/8+kπ
原函数的单调增区间是;[-3π/8+kπ ,-π/8+kπ]
由2kπ≤2x+π/4≤π+2kπ得:
-π/8+kπ≤x≤3π/8+kπ
原函数的单调增区间是;[-π/8+kπ ,3π/8+kπ]