CÁLCULO LOGARÍTMICO:
log a b = log a + log b
log a/b = log a - log b
log a^b = b log a
log raiz( b-ésima , a ) = log a^(1/b) = log a / b

FÓRMULA DE EULER:
e^zi  = cos z + i sen z
e^-zi = cos z - i sen z

sen z = ( e^zi - e^-zi ) / 2i
cos z = ( e^zi + e^-zi ) / 2


(x + a)^n = sumatorio( (n sobre k) a^k x^(n-k) )
             k=0...n

(n sobre k) = n! / ( k! (n-k)! )