Overview: 4 questions will be solved this time.Among them
           ☆4 equations

[ 1/4 Equation]
    Work: Find the solution of equation cos(x/2)+0.05*cos(x+30)+0.05*cos(3*x/2+120) = 0 .
    Question type: Equation
    Solution:
    The solution of the equation:
        x₁≈-28.180848 , keep 6 decimal places
        x₂≈-21.947605 , keep 6 decimal places
        x₃≈-15.614477 , keep 6 decimal places
        x₄≈-9.381235 , keep 6 decimal places
        x₅≈-3.048107 , keep 6 decimal places
        x₆≈3.185136 , keep 6 decimal places
        x₇≈9.518264 , keep 6 decimal places
        x₈≈15.751507 , keep 6 decimal places
        x₉≈22.084635 , keep 6 decimal places
        x₁₀≈28.317877 , keep 6 decimal places    
    There are 10 solution(s).    *Note: Radian.

解程的详细方法请参阅：《方程的解法》
[ 2/4 Equation]
    Work: Find the solution of equation cos(x/2)+0.05*cos(x+30)+0.05*cos(3*x/2+150) = 0 .
    Question type: Equation
    Solution:
    The solution of the equation:
        x₁≈-28.344284 , keep 6 decimal places
        x₂≈-22.077939 , keep 6 decimal places
        x₃≈-15.777914 , keep 6 decimal places
        x₄≈-9.511568 , keep 6 decimal places
        x₅≈-3.211543 , keep 6 decimal places
        x₆≈3.054802 , keep 6 decimal places
        x₇≈9.354827 , keep 6 decimal places
        x₈≈15.621173 , keep 6 decimal places
        x₉≈21.921198 , keep 6 decimal places
        x₁₀≈28.187544 , keep 6 decimal places    
    There are 10 solution(s).    *Note: Radian.

解程的详细方法请参阅：《方程的解法》
[ 3/4 Equation]
    Work: Find the solution of equation cos(x/2)+0.05*cos(x+30)+0.05*cos(3*x/2+180) = 0 .
    Question type: Equation
    Solution:
    The solution of the equation:
        x₁≈-28.339280 , keep 6 decimal places
        x₂≈-22.071046 , keep 6 decimal places
        x₃≈-15.772909 , keep 6 decimal places
        x₄≈-9.504675 , keep 6 decimal places
        x₅≈-3.206538 , keep 6 decimal places
        x₆≈3.061696 , keep 6 decimal places
        x₇≈9.359832 , keep 6 decimal places
        x₈≈15.628066 , keep 6 decimal places
        x₉≈21.926203 , keep 6 decimal places
        x₁₀≈28.194437 , keep 6 decimal places    
    There are 10 solution(s).    *Note: Radian.

解程的详细方法请参阅：《方程的解法》
[ 4/4 Equation]
    Work: Find the solution of equation cos(x/2)+0.05*cos(x+30)+0.05*cos(3*x/2+210) = 0 .
    Question type: Equation
    Solution:
    The solution of the equation:
        x₁≈-28.214363 , keep 6 decimal places
        x₂≈-21.965714 , keep 6 decimal places
        x₃≈-15.647993 , keep 6 decimal places
        x₄≈-9.399344 , keep 6 decimal places
        x₅≈-3.081622 , keep 6 decimal places
        x₆≈3.167027 , keep 6 decimal places
        x₇≈9.484749 , keep 6 decimal places
        x₈≈15.733398 , keep 6 decimal places
        x₉≈22.051119 , keep 6 decimal places
        x₁₀≈28.299768 , keep 6 decimal places    
    There are 10 solution(s).    *Note: Radian.

解程的详细方法请参阅：《方程的解法》

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