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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 5sinx >2cos2x-4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        5 * sin x >2 * cos 2 * x - 4         (1)

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    From inequality(1)：
         -6.071022 < x < -2.801382 或  x ＞ -0.742802

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    The final solution set is :
         -6.071022 < x < -2.801382 或  x ＞ -0.742802
    *Note: Radian.

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