Mathematics
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    1/3×9%
    sin5
    261-(-1)-259
    sin(7π/2)
    sin(6π/2)
    sin(5π/2)
    sin(4π/2)
    sin(3π/2)
    sin(3π)/2
    97790÷(1+8.3%)×(1+6.9%)
    97790×(1+8.3%)×(1+6.9%)
    97790÷(1+8.3%)×(1+6.9%)
    8.3%×6.9%
    8.3%÷6.9%
    97790÷(1+8.3%)×(1+6.9%)
    (1+8.3%)×(1+6.9%)
    cos23
    cos30
    cos30
    381×(1-2%)

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