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           ☆1 arithmetic calculations

[1/1 Formula]
    Work: Calculate the value of equation arccos(1/2)-arccos(-1/2) .
    Question type: Mathematical calculation
    Solution:
          arccos(1/2)-arccos(-1/2)
        =arccos0.5-arccos(-1/2)
        =arccos0.5-arccos(-0.5)
        =1.047198-arccos-0.5
        =1.047198-2.094395
        =-1.047197
    Answer:arccos(1/2)-arccos(-1/2)=-1.047197
    Note: Radian

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