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

[ 1/1 Equation]
    Work: Find the solution of equation sqrt{-5×e（-21.8×x）×[0.3×cos（102×π×x）＋sin（102×π×x）]＋5×cos（100×π×x-0.4×π）}^2＋{-18×e（-21.8×x）×[cos（102×π×x）＋0.2×sin（102×π×x）]＋18×sin（100×π×x-0.4×π）}^2 = 1 .
    Question type: Equation
    Solution:    This equation has no real solution!

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