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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1/2(cos-xsinx) >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1 / 2 * ( cos -x * sin x ) >0         (1)

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    From inequality(1)：
         -15.707963 < x < -12.566371 或  -9.424778 < x < -6.283185 或  -3.141593 < x < 0 或  0 < x < 3.141593 或  6.283185 < x < 9.424778

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    The final solution set is :
         -15.707963 < x < -12.566371 或  -9.424778 < x < -6.283185 或  -3.141593 < x < 0 或  0 < x < 3.141593 或  6.283185 < x < 9.424778
    *Note: Radian.

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