cos90*21.65
    cos60*21.65
    cos30/21.65
    cos30*21.65
    sin60*25
    cos60
    [(1+x)/x]*3.15%=0.6049
    307*91
    17*17
    1/7
    3√27
    π
    1734*2.355^-0.25
    (50-x)^0.75=0.24855*(x-40)
    1734*2.35^-0.25
    (50-x)^0.75=0.24858*(x-40)
    (t+1)(t+2)(t+3)
    0.35/384
    0.35/395
    0.038762+16.579715*0.000721+16.08/1387.4

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