=(sin 2 x+cos 2 x)2-3sin 2 xcos 2 x. =1-3/4sin 2 x. =5/8+3/8cos4x. ∴最小正周期為T=π/2. (3). 它與-cos2x的周期相同,故得f(x)的最小正周期為T=π ...
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