y=sin(-3x+3.14/4)的单调递增区间是

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y=sin(-3x+3.14/4)的单调递增区间是
y=sin(-3x+3.14/4)的单调递增区间是

y=sin(-3x+3.14/4)的单调递增区间是
y=sin(-3x+π/4)=sin(3x+3π/4),增区间是2kπ-π/2≤3x-3π/4≤2kπ+π/2,解得[2kπ/3+π12,2kπ/3+5π/12].其中k是整数.

由题得 -π/2+2Kπ≤-3x+π/4≤π/2+2Kπ 解得增区间为[2kπ/3+π12,2kπ/3+5π/12]

hytj

-3x+pi/4=2kpi+pi/2 x=-2kpi/3-pi/12
-3x+pi/4=2kpi+3pi/2 x=-2kpi/3-5pi/12
单调增区间[-2kpi/3-5pi/12,-2kpi/3-pi/12]