f(x)=3sin(2x+π/3),则比较f(1),f(2),f(3)三者大小、怎么比啊?
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![f(x)=3sin(2x+π/3),则比较f(1),f(2),f(3)三者大小、怎么比啊?](/uploads/image/z/10335149-53-9.jpg?t=f%28x%29%3D3sin%282x%2B%CF%80%2F3%29%2C%E5%88%99%E6%AF%94%E8%BE%83f%281%29%2Cf%282%29%2Cf%283%29%E4%B8%89%E8%80%85%E5%A4%A7%E5%B0%8F%E3%80%81%E6%80%8E%E4%B9%88%E6%AF%94%E5%95%8A%3F)
f(x)=3sin(2x+π/3),则比较f(1),f(2),f(3)三者大小、怎么比啊?
f(x)=3sin(2x+π/3),则比较f(1),f(2),f(3)三者大小、怎么比啊?
f(x)=3sin(2x+π/3),则比较f(1),f(2),f(3)三者大小、怎么比啊?
f(1)=3sin(2+π/3),f(2)=3sin(4+π/3),f(3)=3sin(6+π/3)
2+π/3是第二象限角;4+π/3是第四象限角;6+π/3是第一象限角
所以f(1)>0,f(2)0
f(1)=3sin(2+π/3)=3sin(2π/3-2),f(3)=3sin(6+π/3)=3sin(6-5π/3),
0
用画图的方法