(tan(17.65)-17.65)-(tan(20)-20)
    48/(2*tan(20))
    tan(20)- 20
    tan(32.61)-32.61
    0.9*3.1415926
    1+2+3+4+...+2024
    1+2+3+4+....+2024
    44.484/7.2
    44.48/7.2
    44.484/7.2
    44.484*7.2
    37.07+37.07×0.2=
    (15+10.8+2）/(1-0.15-0.1)=
    34.75/（1-0.2）=
    34.75/（1-0.2）=
    34.75*（1-0.2）=
    34.75+34.75*0.2=
    15+10.8+2+（15+10.8+2）×0.15+（15+10.8+2）×0.1=
    sqrt(9/16)
    3184.09/(1+1.5%)^4

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