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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality x     Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x < sin ( π * x / 4 ) - 1 / 6         (1)

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    From inequality(1)：
         x < -2/3

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    The final solution set is :
         x < -2/3
    *Note: Radian.

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