cos(π/3)－tan(π/4)＋(3/4)tan(π/6)－sin(π/6)＋cos(π/6)－sin(3π/2)＋cosπ
=1/2-1+(√3/4)-1/2+(√3/2)+1-1
=-1+(3√3/4)
计算：cox（π/3）－tan（π/4）＋（3/4）tan（π/6）－sin（π/6）＋cos（π/6）...
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