tan(90.000001)
    tan(90.000000)
    C(11,2)C(11,5)C(11,5)C(10,5)C(9,2)C(10,5)C(9,5)C(16,5)C(7,2)C(7,5)C(7,2)C(9,5)C(12,5)
    arccos((sqrt(10+2sqrt5)-sqrt15+sqrt3)/8)
    arccos((sqrt(10-2sqrt5)-sqrt15+sqrt3)/8)
    (1*2+2*3）*（1/1*2+1/2*3）+(2*3+3*4)*(1/2*3+1/3*4)+...+(19*20+20*21)*(1/19*20+1/20*21)
    （1*2+2*3）*（1/1*2+1/2*3）
    9^500+9^510+(1/3)^2021
    C(12,5)
    C(9,5)
    C(7,2)=
    C(7,5)=
    C(7,2)=
    C(16,5)=
    C(9,5) =
    C(10,5)=
    C(9,2)=
    C(10,5)=
    C(11,5)=
    C(11,5)=

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