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

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

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    From inequality(1)：
         -15.244316 < x < -12.102723 或  -8.96113 < x < -5.819538 或  -2.677945 < x < 0.463648 或  3.60524 < x < 6.746833 或  9.888426 < x < 13.030018

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    The final solution set is :
         -15.244316 < x < -12.102723 或  -8.96113 < x < -5.819538 或  -2.677945 < x < 0.463648 或  3.60524 < x < 6.746833 或  9.888426 < x < 13.030018
    *Note: Radian.

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