请问 π/6≤(2x/3 + π/6) ≤ 5π/6 怎么变成 1\2 ≤ sin(2x/3 + π/6)≤1
1个回答
sin π/6=sin 5π/6=1/2
从π/6到π/2单调增,从π/2到5π/6 单调减,最大值1,最小值1/2,所以12 ≤ sin(2x/3 + π/6)≤1
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