函数y=2cos(2x+π/3)(x∈[-π,0])的单调增区间
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![函数y=2cos(2x+π/3)(x∈[-π,0])的单调增区间](/uploads/image/z/2832318-54-8.jpg?t=%E5%87%BD%E6%95%B0y%3D2cos%282x%2B%CF%80%2F3%29%28x%E2%88%88%5B-%CF%80%2C0%5D%29%E7%9A%84%E5%8D%95%E8%B0%83%E5%A2%9E%E5%8C%BA%E9%97%B4)
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函数y=2cos(2x+π/3)(x∈[-π,0])的单调增区间
函数y=2cos(2x+π/3)(x∈[-π,0])的单调增区间
函数y=2cos(2x+π/3)(x∈[-π,0])的单调增区间
递减区间为[2kπ,2kπ+π/2]
y=2cos(2x+π/3)变成y=2cos[2(x+π/6)],再画图,得到单调增区间为[-2π/3,-π/6]
导数大于零。。。
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