lg1.89
    1.89÷5.22
    297.15*307.15
    8.314*2.303
    0.01÷0.0053
    0.08∧1.10
    0.04∧1.10
    0.08∧1.12
    1 * （1+0.26）^10
    arccos(0.074)
    arccos(353.37/367.01)
    arccos(95.3/367.01)
    arccos(27.32/367.01)
    1000/(1-(1+(0.075/28)^(-336))/(0.075/28))
    arctan(5/4)
    arctan(4/5)
    arctan(6.4/8)
    arctan(7.07/8)
    arctan(5/8)
    arctan(-5/8)

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