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y=1-3cos^2(x/3+π/6)周期是
人气:411 ℃ 时间:2020-10-01 21:52:57
解答
f(x)=3cos(1/2x-π/6) x∈R (1)f(x)=Acos(wx-π/6)x T=21/2x-π/6=2kπ x=π/3 4kπ解集是{x|x=π/3 4kπ}
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