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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality cosC >-cos2C .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         cos C > - cos 2 * C         (1)

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    From inequality(1)：
         -14.137167 < C < -10.995574 或  -7.853982 < C < -4.712389 或  -1.570796 < C < 1.570796 或  4.712389 < C < 7.853982 或  10.995574 < C < 14.137167

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    The final solution set is :
         -14.137167 < C < -10.995574 或  -7.853982 < C < -4.712389 或  -1.570796 < C < 1.570796 或  4.712389 < C < 7.853982 或  10.995574 < C < 14.137167
    *Note: Radian.

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