Mathematics
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    6×(π÷2-2×1.05×tan20)
    6×(π÷2+2×1.05×tan20)
    60×cos20÷cos13.35
    2×tan((20)×(-0.64)÷45)+0.0149
    2×tan(20)×(-0.64)÷45+0.0149
    6÷(-3)加2^2×(1-√4)
    2tan(20×(-0.64)÷45)
    cos60
    cos30
    1/3.6×0.03×30+〖30〗^2/(25.92×0.84×0.8×9.8)=
    1/3.6×0.03×30+〖30〗^2/(25.92×0.71×0.8×9.8)=
    arccos0.6611
    arccos0.8781
    arccos0.8187
    21.5-12.9=
    (14.9*220+10.54*200)/420=
    (1000*16.5+300*11.5+67*6)/1367=
    5*10+15*18+13+10+3*14+38*11.5+3*24+19*6+16+3*10=
    5/102+15/133.58+13/44.7+3/45.1+14/500+.024=
    1-exp(0.509696532304)

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