Studied by 67 people
1/1-x
1 + x + x² + … + xn +… = ∑ xn
(|x| < 1)
1/1+x
1 - x + x² - … + (-1)n xn + … = ∑ (-1)n xn
(|x| < 1)
ex
1 + x + x²/2! + … + xn/n! + … = ∑ xn/n!
(all real x)
sin(x)
x - x³/3! + x5/5! - … = ∑ (-1)n[x2n+1/(2n + 1)!]
(all real x)
cos(x)
1 - x²/2! + x4/4! - … = ∑ (-1)n[x2n/(2n)!]
(all real x)
ln(1+x)
x - x²/2 + x³/3 - … + … = ∑ (-1)n-1(xn/n)
(-1 < x < 1)
tan-1(x)
x - x³/3 + x5/5 - … + … = ∑ (-1)n[x2n+1/(2n + 1)]
(|x| < 1)
Note 
Flashcard (335)