5^8
    35+10+16+9.5+10+27+9+6.5+60+10+8
    200*60*0.9+300*30*0.9+160*80/2*0.9+240*40/2*0.9
    arctan999999999999999
    sin30+arcsin30 tan30+arctan30
    tan(89.999999)
    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)=

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