Mathematics
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    (2+65)×50 20×(5+29) (2+40)×25 (20+45)×50 (4+50)×25 40×(25+62) 40×(78+25) 5×(20+67)
    tan(arccos0.86)-tan(arccos0.85)
    tan(arccos0.81)-tan(arccos0.85)
    tan(arccos0.8)-tan(arccos0.85)
    tan(arccos0.79)-tan(arccos0.85)
    tan(arccos0.7)-tan(arccos0.85)
    tan(arccos1.02)-tan(arccos0.85)
    tan(arccos0.75)-tan(arccos0.85)
    tan(arccos0.78)-tan(arccos0.85)
    tan(arccos0.78)
    tan(arccos0.85)
    (-4/15)×(-5/13)+(-2/5)×2/7
    -1000+32
    1×(-8)×(-3/1)-1-5
    (3/8-1/6 )×48
    1.257×8
    25.8×990+258
    4.5×4/5+6.5×80%-0.8
    43/87×86
    (8/15+3/5)×30

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