log(100) = 4.60517018598809
sprintf("%.0f", 7.8) = 8
pow(2, 3) = 8
exp(1) = 2.71828182845905
2**3 = 8
sin(3.14) = 0.00159265291648683
cos(0) = 1
join(',', 'a', 'b', 'c') = a,b,c
join(',', 'a', 'b', 'c') = a,b,c
