Mathematics
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    100+100=
    0.034049/(1+190338^2)
    0.6*2.5499^2-7.8*2.5499+24+19.2*sin(15*2.5499)-6.24*2.5499*sin(15*2.5499)-14.4cos(15*2.5499)+2.88*2.5499*cos(15*2.5499)
    0.6*2.5499^2-7.8*2.5499+24+19.2+sin(15*2.5499)-6.24*2.5499*sin(15*2.5499)-14.4cos(15*2.5499)+2.88*2.5499*cos(15*2.5499)
    2+3+4
    f×(sin60+sin30)=20
    6y+150=7y-200
    arcsec(-2)
    arcsec-2
    (x-100)×(1300-5x)
    40+0.4x+0.4x+0.004*x^x=48.4
    40+0.4x+0.4x+0.004x^x=48.4
    (40+0.4x)(1+0.01x)=48.4
    (40+0.4)(1+0.01)
    (40+0.4x)(1+0.01x)
    0.5*(-7/12)^2-1.25*(-7/12)-1
    40÷4x=5
    0.85*44X+0.15*15X=12500*0.52
    0.85*44X+0.15*15X=18014*0.52
    4*(k+1)^2-4*k*(k-1)

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