Mathematics
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    ((50-70)²+(60-70)²+(70-70)²+(80-70)²+(90-70)²)/4
    4^2+(-8+4)*2^2+4
    4^2-4*2^2+4
    arcsin0.0325
    √9
    arccos(sqrt(2/3))
    2862.413/9.81
    1811.917/9.81
    acos(0.5)
    acos(0.5)
    ln(9/7)
    sin(1/7)
    sin1/7
    2sin(160-60)
    2sin(140-60)
    4.61×7/3-5.39×(-7/3)+3×(-7/3)
    4.61×7/3-5.39(-7/3)+3×(-7/3)
    400×(0.35+0.15×105/100+0.1×89/85+0.3×188.6/113.4+0.1×113/110-1)
    100×(0.35+0.15×105/100+0.1×89/85+0.3×188.6/113.4+0.1×113/110-1)
    100×(0.35+0.15×105/100+0.1×89/85+0.3×118.6/113.4+0.1×113/110)

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