asin0.469
    asin0.5
    asin0.49
    72/（1.7*1.7）
    (952÷891-1+1019÷952-1+1020÷1019-1+1121÷1020-1)÷4
    (883÷672-1+901÷883-1+958÷901-1+1011÷958-1)÷4
    (308÷301-1+308÷308-1+310÷308-1+310÷310-1)÷4
    (1320÷1260-1+1380÷1320-1+1440÷1380-1+1560÷1440-1)÷4
    (264÷240-1+301÷264-1+371÷301-1+399÷371-1)÷4
    （342÷323-1+361÷342-1）÷4
    12-1
    tan 20.81857=
    tan 15.00540 =
    tan 10.53814 =
    tan 8.18997 =
    tan 6.41521 =
    tan 6.4521 =
    173.734921/tan70
    173.734921/sin70
    (1.4*287*341.43425)^0.5

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