Sine-squared function

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Definition

This function, denoted \sin^2, is defined as the composite of the square function and the sine function. Explicitly, it is the map:

x \mapsto (\sin x)^2

For brevity, we write (\sin x)^2 as \sin^2x.

Key data

Item Value
Default domain all real numbers, i.e., all of \R
range [0,1], i.e., \{ y \mid 0 \le y \le 1 \}
period \pi, i.e., 180\,^\circ
local maximum value and points of attainment All local maximum values are equal to 1, and are attained at odd integer multiples of \pi/2.
local minimum value and points of attainment All local minimum values are equal to 0, and are attained at integer multiples of \pi.
points of inflection (both coordinates) odd multiples of \pi/4, with value 1/2 at each point.
derivative x \mapsto \sin(2x) = 2\sin x \cos x, i.e., double-angle sine function.
antiderivative x \mapsto \frac{x}{2} - \frac{\sin(2x)}{4} + C
mean value over a period 1/2
expression as a sinusoidal function plus a constant function (1/2) - \cos(2x)/2