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

[ 1/1 Equation]
    Work: Find the solution of equation 213.9*20.42*cos(x)+111.384*55*cos(x-49.31)-0.5*131.1765*80*cos(139.31-x) = 0 .
    Question type: Equation
    Solution:
    The solution of the equation:
        x₁≈-15.194503 , keep 6 decimal places
        x₂≈-12.052910 , keep 6 decimal places
        x₃≈-8.911317 , keep 6 decimal places
        x₄≈-5.769725 , keep 6 decimal places
        x₅≈-2.628132 , keep 6 decimal places
        x₆≈0.513460 , keep 6 decimal places
        x₇≈3.655053 , keep 6 decimal places
        x₈≈6.796646 , keep 6 decimal places
        x₉≈9.938238 , keep 6 decimal places
        x₁₀≈13.079831 , 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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