Mathematics
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    1500+(1200-90)*75%/(4%+6%*1.15)
    1000+(1200-40)*75%/(4%+6%*1.10)
    0+1200*75%/(4%+6%*1.05)
    6^-2
    -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)=

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