π*1
    (sin47.653541)/2+(47.653541/360)*π
    (47.653541/360)*π
    (47.653541/360)
    24000-2400-5.712%
    π/4
    sin47.65
    sin47
    （1+124.798)(500-1000/124.798^2-2000/124.798-2*124.798）
    (1+1/8)(500-1000*4-2000*8-1/4)
    (1+124.798)*(500-1000/124.798^2-2000/124.798-2+124.798)
    (1+0.625)*(500-1000/0.625^2-2000/0.625-2*0.625)
    1×1+4×5-1×4
    1×1 4×5-1×4
    120/tan15
    120/tan28
    1500/sin18
    tan35*20
    sin15*160
    sin10*120

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