Mathematics
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    tan(arccos0.8)
    0.9^30=
    (1-0.06)^30=
    182521213001*25601*21401*41
    271*9
    1.06^30=
    1:4
    1:6
    log5
    arctan(1/2)
    1-1
    arctan6.66
    25×863=
    352×198
    32×94=
    32×94=
    32×94=
    6÷2×(2+1)
    -2500-2000/(1+0.2)+1200×[(1+0.2)^9-1]÷0.2÷(1+0.2)^9÷(1+0.2)
    -2500-2000/(1+0.19)+1200×[(1+0.19)^9-1]÷0.19÷(1+0.19)^9÷(1+0.19)

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