cos(arcsin(3sqrt3/2/sqrt7))-1/sqrt28
    sin(arccos(1/2/sqrt(7))+30)-sqrt3/sqrt7
    2/sin(arccos(1/2/sqrt(7))+30)*sqrt(27)/sqrt(28)
    sin(arccos(1/2/sqrt(7))+30)
    arccos(1/2/sqrt(7))
    arccos(1/2sqrt(7))
    arccos(2sqrt(7))
    (sin(55)*(sqrt(3)-1+(sqrt(3)+1)*tan(20)))^2
    sin(55)*(sqrt(3)-1+(sqrt(3)+1)*tan(20))
    12%/300%
    (1+1/(10^10))^(10^10)
    (4*3^(1/2))/3
    1+10.6%
    26857÷0.106
    26857/1+10.6%
    100×1.1^3
    11^3
    144/1+20%
    （144/1+20%）×20%
    454*1.3+454*1.3*1.3+454*1.3*1.3*1.3+454*1.3*1.3*1.3*1.3

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