Trigonometric functions videos

The trig functions & right triangle trig ratios

Unit circle

Intro to radians

Radians & degrees

Degrees to radians

Radians to degrees

Radian angles & quadrants

Proof of the Pythagorean trig identity

Using the Pythagorean trig identity

Trig values of π/4

Cosine, sine and tangent of π/6 and π/3

Sine & cosine identities: symmetry

Tangent identities: symmetry

Sine & cosine identities: periodicity

Tangent identities: periodicity

Intersection points of y=sin(x) and y=cos(x)

Graph of y=sin(x)

Graph of y=tan(x)

Features of sinusoidal functions

Amplitude & period of sinusoidal functions from equation

Transforming sinusoidal graphs: vertical stretch & horizontal reflection

Transforming sinusoidal graphs: vertical & horizontal stretches

Example: Graphing y=3⋅sin(½⋅x)-2

Example: Graphing y=-cos(π⋅x)+1.5

Sinusoidal function from graph

Interpreting trigonometric graphs in context

Trig word problem: modeling daily temperature

Trig word problem: length of day (phase shift)

Trig word problem: modeling annual temperature

Tau versus pi