log(2,3)x＞4
    lgx＞lnx＜x
    log(lnx,lgx)＞0
    log(sinx,cosx)＞0
    log(x,2)＞0.5
    asinasinx＞89
    5x-8*3>0
    tanx＜sinx＜100^lnx+10^ln(90-x)
    tanx＜x
    tan90*x＞0
    2≥(1+tanx)(1+tan(45-x))≥2
    1.99＜(1+tanx)(1+tan(45-x))＜2.01
    absx+1≥0≥-xx
    absx≥0≥-xx
    !(5)+0x＞10
    !(x)＞10
    1/sinx≥1
    1:x＜abs(lglglgx)＜3
    lglglgx＞-3
    lg(xx-4x-21)+sqrtx-sqrtx＜2

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