Mathematics
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    (-5)^2-4*-1*-6
    -90-arctan(0.5*4.0776)-arctan(0.1*4.0776)
    3489.8²+1658.7²
    4000/100*(0.7+0.93²*7)
    (4.52+0.93²*28.8
    √[3460.4²+(1688.0-300)²]
    √3460.4²+(1688.0-300)²
    3489.6²+1751.6²
    4000/100*(0.7+0.925²*7)
    4.52+0.925²*28.8
    (7/4-7/8-7/12)*(-8/7)
    (-3/4)*(-1/2)/(-9/8)*3
    -165+265-78-22+65
    tan(arccos0.797)-tan(arccos0.92)
    tan(arccos0.899)-tan(arccos0.92)
    sqrt((3*√5/4+9/4+6*√2/4)* (-3*√5/4+9/4+6*√2/4)* (3*√5/4-9/4+6*√2/4) *(3*√5/4+9/4-6*√2/4))
    2+(-12)除以3乘1/3
     245/4 292/5 306/6 340/6 381/7 388/7 425/8 436/8 456/9 531/10 681/13
    e(-0.9551)
    2^-1/2

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