180-90-arctan(0.2*5)-arctan(0.5*5)+arctan(0.5*5)-arctan(0.08*5)
    180-90-arctan(0.2*sqrt(10))-arctan(0.5*sqrt(10))
    32*80-256
    32*7/8/2/3
    180-90-arctan(0.5*2*sqrt(5))-arctan(0.1*2*sqrt(5))
    1/4*4/3+1/2
    12345678915723769454313391925725784513319497276+8134272919849134376918427679766731516
    43*126-32*126-126
    1/8:1/4
    1.2*sqrt(5)
    4/15*5/7+2/15*4/7
    （4/5）sqrt（5）
    0.79/(1+e^(1.118-0.094*(-2)))
    0.79/(1+e^(1.118-0.094*2))
     ( 2 / 3 * -21 / 5 - 4 ) - ( 2 * -21 / 5 - 3 ) / 5
    （5/3）^(4/3)
    （2/3）^(1/3)
    （2/3）^(4/3)
    1/(91/5-2.4/2)-3
    221^2-121^2

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