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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 0.7580 ≤0.4630cosx-0.2333sinx .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.7580 ≤0.4630 * cos x - 0.2333 * sin x         (1)

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    From inequality(1)：
        The solution set is empty, that is, within the range of real numbers, the inequality will never be established!

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    The final solution set is :
        The solution set is empty,that is, the inequality will never be estatlished within the real number range.

    *Note: Radian.
[ 2/2 Equation]
    Work: Find the solution of equation cosx×cosx+sinx×sinx = 1 .
    Question type: Equation
    Solution:
    This equation is an identity!

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