Mathematics
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    tan(20)*tan(80)*tan(30)
    tan(60)/tan(40)
    tan(20)*tan(80)
    89.75*1.11
    (sin(20)*sin(30)
    log(1.1,20)
    704.9/(30+750/1.1+150/1.1^2)
    A(5,2)
    -30-750/1.1-150/1.1^2+225/1.1^3+375/1.1^4+375/1.1^5+375/1.1^6+375/1.1^7+375/1.1^8+375/1.1^9+375/1.1^10
    70+13/1.15^10
    20lg(20000)
    e^0.7881
    ln0.023
    e^(-0.591473)
    2.2+0.74*ln0.023
    ln5.204
    1.5*ln5.204
    sqrt(2)
    sqrt(20)
    0.9275 + 0.1039 ×5.204

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