161.4389*cos35.9060
    1+1=
    ln19999/ln10000
    ln19999/ln10000-ln20001/ln10001
    ln199/ln100-ln201/ln101
    ln9/ln5-ln11/ln6
    ln7/ln4-ln9/ln5
    ln7/ln4
    lg0.5-lg0.28728
    lg2+lg5
    2.3+9×(22-19.7)
    sqrt(105/124)
    100÷(1+0.13)×0.13=
    A(3,2) C(2,2)
    A(3,2) C(3,2)
    log(2,sqrt(2)) abs(-3)+tan45 abs(x)+3=6 x+log(x,27)=6
    log(2,sqrt(2)) abs(-3)+tan45 abs(x)+3=6 x+log(x,27)=6
    log(2,sqrt(2))
    log(3,9)
    log(3,27)

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