arctan(π/4)
    sinπ/4
    arctan0
    arctan0
    arctanπ/4-arctan(-π/4)
    arctanπ/4
    arctanπ/4
    2028119*247629013*9
    2028119*247629013*9
    339*0.643
    1881/9
    877203327879*1111111
    123551*271*71*369
    123551*4649*271*239*71*41*9
    0.5:0.35
    11.6%+1+20.3%+1
    48.4%+4
    1*99+2*97+3*95+......+49*3+50*1
    1*99+2*97+3*95...49*3+50*1
    1*99+2*97+3*95...49*3+50*1

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