(-1/36)/[(1/6)-(5/12)+(2/3)-(7/9)]
    (7/6)*(1/6)-(1/3)*(3/14)*(3/5)
    tan3π
    1/sin11/sin11/sin11/sin11
    1/sin9.5/sin9.5/sin9.5/sin9.5
    1/sin8/sin8/sin8/sin8
    1/sin6.5/sin6.5/sin6.5/sin6.5
    1/sin5/sin5/sin5/sin5
    1/sin(5)^4
    18732158062+15103319194
    75*1.39*10^3
    16sin(2π/3+3π/2)
    10lg(5)=
    10lg(5)=
    10lg(5)=
    （-0.25）^3-0.25+1
    10lg(300)=
    -10lg(300)=
    20lg100
    10lg(0.001)=

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