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
    5-2(x+2)<=3
    x∧2-4x-5＜0
    x^2-2x<0
    x^2>2x
    x2>2x
    (1+x/1-x)＞0
    (0.5x-1)（0.5x-1）-4x(1-0.5x)＞0

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