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

[ 1/1 Equation]
    Work: Find the solution of equation 0.5 = cosa .
    Question type: Equation
    Solution:
    The solution of the equation:
        a₁≈-13.613568 , keep 6 decimal places
        a₂≈-11.519173 , keep 6 decimal places
        a₃≈-7.330383 , keep 6 decimal places
        a₄≈-5.235988 , keep 6 decimal places
        a₅≈-1.047198 , keep 6 decimal places
        a₆≈1.047198 , keep 6 decimal places
        a₇≈5.235988 , keep 6 decimal places
        a₈≈7.330383 , keep 6 decimal places
        a₉≈11.519173 , keep 6 decimal places
        a₁₀≈13.613568 , 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》

Your problem has not been solved here? Please take a look at the  hot problems ！