TriangleWave
A function whose graph is a triangle wave.
Syntax

TriangleWave(x)

x
is a real number

Description
TriangleWave(x)
is a triangle wave with amplitude 1
and wavelength 2⋅π
. The range is [−1, 1]
and the graph is a straight line through the origin from x = −π/2
to x = π/2
.