0.19*21*21/19/19-0.42*21/19+1.49
    0.19*21*21/19/19
    0.00081*3
    0.00081*3+0.135*2-0.006*5
    -0.141*3+2*(-1.135)+1.006*5
    0.135*0.006
    0.135+0.006
    3+4.159+1.585
    6-1.585*2
    4.585-4.159
    0.497*3+0.094
    -4.278+0.119
    0.497*3+0.819*2-5*0.607
    -1.426*3+(-1.819)*2+5*1.607
    0.607*0.819
    0.607+0.819
     e^(-0.5)
    e^(-0.2)
    90-arctan(0.2*8)-arctan(0.5*8)-arctan(0.012*8)+arctan(1.26*8)
    0.012*104.86

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