Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality lgx     Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         lg x < arccos x         (1)
        From the definition field of lg
        x > 0        (2 )
        From the definition field of arccos
        x ≥ -1        (3 )
        x ≤ 1        (4 )

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    From inequality(1)：
         x ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!
    From inequality(2)：
         x ＞ 0
    From inequality(3)：
         x ≥ -1
    From inequality(4)：
         x ≤ 1

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    From inequalities (1) and (2)
         x ＞ 0    (5)
    From inequalities (3) and (5)
         x ＞ 0    (6)
    From inequalities (4) and (6)
         0 < x ≤ 1     (7)

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    The final solution set is :
         0 < x ≤ 1

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