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

[ 1/1 Equation]
    Work: Find the solution of equation arctan(x)+arctan(0.25x)+arctan(x/0.066)+arctan(x/4.828)-arctan(x)-arctan(5x)-arctan(x/0.829) = 90 .
    Question type: Equation
    Solution:    This equation has no real solution!

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