F- x - - band - was created in 2009.
E. F. Band was created in 1979.
Monster X - band - was created in 1992.
X - Australian band - was created in 1977.
Planet X - band - was created in 2000.
Generation X - band - was created in 1976.
F-Zero X was created in 1998-07.
Lollipop - f- x - song - was created on 2011-04-20.
f(x)
SM Entertainment's f(x).
Racer X is an American band created in 1985 in Los Angeles, California. Racer X performs heavy metal. Heavy metal is a genre of rock created in the late 1960s.
3 x f x f x f x f x f x f = 3f6
Suppose you wish to differentiate x/f(x) where f(x) is a differentiable function of x, and writing f for f(x) and f'(x) for the derivative of f(x), d/dx (x/f) = [f - x*f']/(f2)