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[1/1 Formula]
    Work: Calculate the value of equation arctan(30/2)+arctan(30/6)-arctan(30/12)-arctan(30/60)-arctan(30/80) .
    Question type: Mathematical calculation
    Solution:
          arctan(30/2)+arctan(30/6)-arctan(30/12)-arctan(30/60)-arctan(30/80)
        =arctan15+arctan(30/6)-arctan(30/12)-arctan(30/60)-arctan(30/80)
        =arctan15+arctan5-arctan(30/12)-arctan(30/60)-arctan(30/80)
        =arctan15+arctan5-arctan2.5-arctan(30/60)-arctan(30/80)
        =arctan15+arctan5-arctan2.5-arctan0.5-arctan(30/80)
        =arctan15+arctan5-arctan2.5-arctan0.5-arctan0.375
        =1.504228+arctan5-arctan2.5-arctan0.5-arctan0.375
        =1.504228+1.373401-arctan2.5-arctan0.5-arctan0.375
        =1.504228+1.373401-1.19029-arctan0.5-arctan0.375
        =1.504228+1.373401-1.19029-0.463648-arctan0.375
        =1.504228+1.373401-1.19029-0.463648-0.358771
        =2.877629-1.19029-0.463648-0.358771
        =1.687339-0.463648-0.358771
        =1.223691-0.358771
        =0.86492
    Answer:arctan(30/2)+arctan(30/6)-arctan(30/12)-arctan(30/60)-arctan(30/80)=0.86492
    Note: Radian

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