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    Work: Find the solution of equation arcsin((sin(15)*x+sin(15)*0.881439)/2)*2+arccos(0.881439) = arccos(x) .
    Question type: Equation
    Solution:
    The solution of the equation:
        x₁=-1, it is the incremental root of the eqution.
        x₂≈0.291810 , keep 6 decimal places    
    There are 2 solution(s).
    There is(are) 1 additive root(s) and 1 real solutions.(Note:additive root, generated by computer, but not suitable for this equation.)
    *Note: Radian.

解程的详细方法请参阅：《方程的解法》

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