# Which of the twelve basic functions are bounded above?

The Sine function: $f \left(x\right) = \sin \left(x\right)$
The Cosine function: $f \left(x\right) = \cos \left(x\right)$
The Logistic function: $f \left(x\right) = \frac{1}{1 - {e}^{- x}}$