Mathematics
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    2*(0.21*√(0.34^2-0.213^2)+π/180*0.34^2*arcsin(0213/0.34))
    cos(3.1415926535/7)
    cos((12*1+1)*3.1415926535/36)*12^(1/12)
    cos((12*1+1)*3.1415926535/36)
    cos((12*0+1)*3.1415926535/36)
    12^(1/12)
    2^3-3×2^2+4
    (3^5×5^6)÷(3^4×5^6)
    3^5×5^6
    (8000000+800000+200000-800000)/40=
    909.200685/4
    10.27*491^2*610*6.02*10^(-7)
    10.27*491^2*610*10^(-30)*6.02*10^23
    1.525082*4
    2.31^2-(3.47/2)^2=
    sqrt(2.325875)
    2.876÷(1+14.8%)
    865+830+450+220+(450+400+400)+110=
    1560+200+820+75+160=
    1800000-50000=

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