-90-arctan0.1×1-arctan0.01×1-arctan(1/0.375)-arctan(1/84.85)＋arctan(1/3)＋arctan(1/10.61)=_ Mathematical calculation

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

[1/1 Formula]
    Work: Calculate the value of equation -90-arctan0.1×1-arctan0.01×1-arctan(1/0.375)-arctan(1/84.85)+arctan(1/3)+arctan(1/10.61) .
    Question type: Mathematical calculation
    Solution:
          -90-arctan0.1×1-arctan0.01×1-arctan(1/0.375)-arctan(1/84.85)+arctan(1/3)+arctan(1/10.61)
        =-90-arctan0.1×1-arctan0.01×1-arctan2.666667-arctan(1/84.85)+arctan(1/3)+arctan(1/10.61)
        =-90-arctan0.1×1-arctan0.01×1-arctan2.666667-arctan0.011786+arctan(1/3)+arctan(1/10.61)
        =-90-arctan0.1×1-arctan0.01×1-arctan2.666667-arctan0.011786+arctan0.333333+arctan(1/10.61)
        =-90-arctan0.1×1-arctan0.01×1-arctan2.666667-arctan0.011786+arctan0.333333+arctan0.094251
        =-90-0.099669×1-arctan0.01×1-arctan2.666667-arctan0.011786+arctan0.333333+arctan0.094251
        =-90-0.099669×1-0.01×1-arctan2.666667-arctan0.011786+arctan0.333333+arctan0.094251
        =-90-0.099669×1-0.01×1-1.212026-arctan0.011786+arctan0.333333+arctan0.094251
        =-90-0.099669×1-0.01×1-1.212026-0.011785+arctan0.333333+arctan0.094251
        =-90-0.099669×1-0.01×1-1.212026-0.011785+0.32175+arctan0.094251
        =-90-0.099669×1-0.01×1-1.212026-0.011785+0.32175+0.093973
        =-90-0.099669-0.01×1-1.212026-0.011785+0.32175+0.093973
        =-90-0.099669-0.01-1.212026-0.011785+0.32175+0.093973
        =-90.099669-0.01-1.212026-0.011785+0.32175+0.093973
        =-90.109669-1.212026-0.011785+0.32175+0.093973
        =-91.321695-0.011785+0.32175+0.093973
        =-91.33348+0.32175+0.093973
        =-91.01173+0.093973
        =-90.917757
    Answer:-90-arctan0.1×1-arctan0.01×1-arctan(1/0.375)-arctan(1/84.85)+arctan(1/3)+arctan(1/10.61)=-90.917757
    Note: Radian

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