求y=sin[2x+(π/3)]的单调性

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求y=sin[2x+(π/3)]的单调性求y=sin[2x+(π/3)]的单调性求y=sin[2x+(π/3)]的单调性2kπ-π/2≤2x+(π/3)≤2kπ+π/2,2kπ-5π/6≤2x≤2kπ

求y=sin[2x+(π/3)]的单调性
求y=sin[2x+(π/3)]的单调性

求y=sin[2x+(π/3)]的单调性
2kπ-π/2≤2x+(π/3)≤2kπ+π/2,
2kπ-5π/6≤2x≤2kπ+π/6,
kπ-5π/12≤x≤kπ+π/12.

2kπ+π/2≤2x+(π/3)≤2kπ+3π/2,
2kπ+π/6≤2x≤2kπ+7π/6,
kπ+π/12≤x≤kπ+7π/12.
综上所述
y在[kπ-5π/12,kπ+π/12],k∈Z上单调递增,
y在[kπ+π/12,kπ+7π/12],k∈Z上单调递减.