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

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

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    From inequality(1)：
         -7.330383 < x < -5.235988 或  -1.047198 < x < 1.047198 或  5.235988 < x < 7.330383

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    The final solution set is :
         -7.330383 < x < -5.235988 或  -1.047198 < x < 1.047198 或  5.235988 < x < 7.330383
    *Note: Radian.

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