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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality sinx*sin7x <1/4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         sin x * sin 7 * x <1 / 4         (1)

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    From inequality(1)：
         -12.596584 < x < -9.384217 或  -6.343211 < x < -3.015046 或  -0.638486 < x < 0.638486 或  3.015046 < x < 6.343211 或  9.384217 < x < 12.596584

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    The final solution set is :
         -12.596584 < x < -9.384217 或  -6.343211 < x < -3.015046 或  -0.638486 < x < 0.638486 或  3.015046 < x < 6.343211 或  9.384217 < x < 12.596584
    *Note: Radian.

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