25/tan15+460
    3.58*10^(-13)/(e(-275.76/8.314/923))
    (25-460)/(25-0.5*460)
    0.172*21.45
    276*460^0.5*21.45*0.172
    460^0.5
    0.643*tan15
    tan15
    460^0.5
    8.2/tan22.5+460
    3/[5+(2+2)]
    3/(5+(2+2))
    3/5+4
    tan22.5
    30+1
    0.487*517
    0.044^0.23
    2^(-2)=
    2^(-2/3)
    2/2^(5/3)=

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