π÷（√11÷4×2√5）
    （π-atan√2.2）/（2√5×√11÷4）
    （π-atan√（11÷5））/2√5×√（11÷16）
    -90-arctan(2.23/5)-arctan(2.23/10)+180
    -90-arctan(0.5)-arctan(0.25)+180
    -90-arctan(0.5)-arctan(0.25)
    2÷√（55）×atan（-√（11÷5））
    -90-arctan(2.23/25)-arctan(2.23/100)
    tan(sqrt(5))+tan(0.2*sqrt(5))
    tan(sqrt(5))+(0.2*sqrt(5))
    37736÷3.14159265358×0.025÷0.028×0.005÷0.144×7×24÷5×0.0998×0.0995
    10024÷3.14159265358×0.025÷0.028×0.005÷0.144×7×24÷5×0.0998×0.0995
    89617÷3.14159265358×0.025÷0.028×0.005÷0.144×7×24÷5×0.0998×0.0995
    12265÷3.14159265358×0.025÷0.028×0.005÷0.144×7×24÷5×0.0998×0.0995
    5050÷3.14159265358×0.025÷0.028×0.005÷0.144×7×24÷5×0.0998×0.0995
    74166÷3.14159265358×0.025÷0.028×0.005÷0.144×7×24÷5×0.0998×0.0995
    arctan(0.3)=
    arctan(0.3)
    atan0.98
    atan0.98

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