ln2.63+0.9ln2.84
    5/0.268*2+10
    sin 0.07983
    sin0.97983
    9+9.9+9.99+9.999+9.9999+9.99999+9.999999
    tan20-20
    tanarccos0.88
    tanarccos0.89
    tanarccos0.87
    tanarccos0.86
    tanarccos0.95
    tanarccos0.87
    tanarccos0.88
    tanarccos0.89
    tanarccos0.87
    sqrt(100^2+75^2)
    128.10+205.00+36.50+11.62+48.97+141.96
    935×6
    C(5,1)
    C(1,5)

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