(8.9*11.49+20.49*8.3+849.12*3.52+35.92*0.25)/914.43
    arcsin-2.401583710407239819004524886877828054298
    11/15×4/7+4/15×4/7
    arcsin1.731900452488687
    arcsin（-0.691369）
    sin49×37÷51.042
    48×48+37×37-2×37×48×cos49
    ln((ln2)^2+1)
    48×48+37×37-2×48×37cos42
    48×48+37×37-2×48×37cos41
    arcsin0.66920045045045
    arcsin(-0.691368)
    37×sin49÷51.042077
    sqrt（48×48+37×37-2×48×37×cos49）
    48×48+37×37-2×48×37×cos48
    48×48+37×37-2×48×37×cos50
    48×48+37×37-2×48×37×cos34
    48×48+37×37-2×48×37×cos45
    48×48+37×37-2×48×37×cos56
    48×48+37×37-2×48×37×cos49

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