-6^2
    6^25
    6^-25
    1/9.8(33∧2sin30cos30+33cos30(33sin30∧2+19.6×3.1)∧0.5）
    1.05^20
    1.05^12
    1.03^30
    1.03^10
    1/cos45+tan45 -1/cos0-tan0
    1/cos45+tan45
    1/cos30
    1/cos45
    (1+sin45)/cos45
    15*14400/21+6*18000/21
    cos（4/5*π）+cos(8/5*π)+cos(12/5*π)+cos(16/5*π)+cos(20/5*π)=
    cos(4/5*π）=
    5^−18π
    13991*11.2%/(1+11.2%)
    85+70+61-16-12-9+10
    85+70+61

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