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

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

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    From inequality(1)：
         -14.207437 < x < -11.085538 或  -7.978666 < x < -4.91318 或  -2.028758 < x < 0 或  2.028758 < x < 4.91318 或  7.978666 < x < 11.085538

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    The final solution set is :
         -14.207437 < x < -11.085538 或  -7.978666 < x < -4.91318 或  -2.028758 < x < 0 或  2.028758 < x < 4.91318 或  7.978666 < x < 11.085538
    *Note: Radian.

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