f(x)=1/2 + 1/2 * Cos^2(x) + 根号3/4 sin2x
= 1/2 + 1/4 * ( 1+cos2x ) + 根号3/4 sin2x
= 3/4 + 1/4 cos2x + 根号3/4 sin2x
= 1/2 sin ( 2x + pai/6) + 3/4
所以最小 正周期 T= 2Pai/2 = Pai
最大值 5/4,最小值 1/4
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若f(x)=1/2sin^2 (x)+cos^2(x)+根号3/4 sin2x
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