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

[ 1/1 Equation]
    Work: Find the solution of equation -2cos（x+13）sin13 = cos（x-30） .
    Question type: Equation
    Solution:
    The solution of the equation:
        x₁≈-15.108316 , keep 6 decimal places
        x₂≈-11.966723 , keep 6 decimal places
        x₃≈-8.825131 , keep 6 decimal places
        x₄≈-5.683538 , keep 6 decimal places
        x₅≈-2.541945 , keep 6 decimal places
        x₆≈0.599647 , keep 6 decimal places
        x₇≈3.741240 , keep 6 decimal places
        x₈≈6.882833 , keep 6 decimal places
        x₉≈10.024425 , keep 6 decimal places
        x₁₀≈13.166018 , 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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