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[ 1/1 Equation]
    Work: Find the solution of equation x = 3.1415926*(sin(x*90/3.1415926))^2 .
    Question type: Equation
    Solution:
    The solution of the equation:
        x₁≈0.317690 , keep 6 decimal places
        x₂≈0.340701 , keep 6 decimal places
        x₃≈0.641605 , keep 6 decimal places    
    There are 3 solution(s).    *Note: Radian.

解程的详细方法请参阅：《方程的解法》

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