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           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality x+tanx     Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x + tan x < cos x         (1)

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    From inequality(1)：
         -7.853982 < x < -4.906065 或  -4.712389 < x < -2.129558 或  -1.570796 < x < 0.437721 或  1.570796 < x < 1.971385 或  4.712389 < x < 4.921428

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    The final solution set is :
         -7.853982 < x < -4.906065 或  -4.712389 < x < -2.129558 或  -1.570796 < x < 0.437721 或  1.570796 < x < 1.971385 或  4.712389 < x < 4.921428
    *Note: Radian.

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