-6＜x＜8
    （x-2×x+x-2×x+x×x）＜48 x+2×x+2×6＞48
    （x-2×x+x-2×x+x×x）＜48
    x+2×x+2×6＞48
    sqrt(4+24a)<-2-4a
    sqrt(4+24a)>4a-2
    cosx/(sinx)^(1/2)+2(sinx)^(3/2)/cosx>=2
    cosx/(sinx)^(1/2)+(sinx)^(3/2)/cosx>=2
    s<5
    x∧2-5x-6<0
    x∧2-x-6<0
    0<2∧x<8
    x∧2-8x≤0
    x∧2-x-2>0
    x∧2-4≤0
    x∧2-2x-3<0
    2x>7
    x∧2-3x-4≤0
    2∧x≤4
    x∧2-5x+4≤0

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