19.003821tan72.5+50
    74.977374tan9.9+50
    21.353835tan99.9+50
    -91.86tan159.8
    100cos160
    100sin160
    sin160
    tan158.9*-91.86
    50/(tan159.9- tan10.1)
    50/(tan159.8- tan10)
    tan159.8
    50/(tan(159.8)-tan(100))
    （300/27898）*299
    （550/27898）*299
    （750/27898）*299
    （3199/27898）*299
    （11699/27898）*299
    （3200/27898）*299=
    （300/27598）*298=
    （550/27598）*298=

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