Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

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

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    From inequality(1)：
         x < -15.707963 或  -12.566371 < x < -9.424778 或  -6.283185 < x < -3.141593 或  0 < x < 3.141593 或  6.283185 < x < 9.424778 或  x ＞ 12.566371

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    The final solution set is :
         x < -15.707963 或  -12.566371 < x < -9.424778 或  -6.283185 < x < -3.141593 或  0 < x < 3.141593 或  6.283185 < x < 9.424778 或  x ＞ 12.566371
    *Note: Radian.
[ 2/2Inequality]
    Assignment:Find the solution set of inequality cosx <1/2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         cos x <1 / 2         (1)

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    From inequality(1)：
         x < -13.613568 或  -11.519173 < x < -7.330383 或  -5.235988 < x < -1.047198 或  1.047198 < x < 5.235988 或  7.330383 < x < 11.519173 或  x ＞ 13.613568

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    The final solution set is :
         x < -13.613568 或  -11.519173 < x < -7.330383 或  -5.235988 < x < -1.047198 或  1.047198 < x < 5.235988 或  7.330383 < x < 11.519173 或  x ＞ 13.613568
    *Note: Radian.

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