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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality sin(7x)*sin(x) >1/4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         sin ( 7 * x ) * sin ( x ) >1 / 4         (1)

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    From inequality(1)：
         x < -1.832596 或  -1.308997 < x < -0.942478 或  -0.314159 < x < -0.261799 或  0.942478 < x < 1.308997 或  x ＞ 1.832596

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    The final solution set is :
         x < -1.832596 或  -1.308997 < x < -0.942478 或  -0.314159 < x < -0.261799 或  0.942478 < x < 1.308997 或  x ＞ 1.832596
    *Note: Radian.

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