A function that takes the cosine of an angle and maps it on a graph. Since the angle has an infinite number of coterminal angles, the function is periodic.

The legs of a right triangle in the unit circle (cos x, sin x) added together to equal the radius of the circle (1). You can use this equation to derive the other Pythagorean identities.

The angle measured from the initial side (0 radians) to the terminal side of the angle.

The angle formed between the terminal side & x-axis.

The points needed to graph trigonometric functions. The method includes the maximum, minimum, period, amplitude, and x-intercepts. These points are derived from the form y=AsinB(x-C)+D

A function that is like a sine function in the sense that the function can be produced by shifting, stretching, or compressing the sine function.

Related to the period of a function and a measure of rotation rate

Trigonometric functions that take the reciprocal of the basic trigonometric functions. This includes cosecant, secant, and cotangent.

Equations that are true for Right Angled Triangles. This includes the three main trigonometric functions, three reciprocal trigonometric functions, quotient identities, Pythagorean identities, double-angle identities, and half-angle identities.

An inverse of a trigonometric function that seeks to undo the steps solved in the original trig function. Can be expressed as trig-1 or arctrig

The value that is approximate and typically found using a calculator

The value that is exact and typically found from the unit circle

Divides an angle by 2. This angle also has the identity: cos2(Θ)-sin2(Θ)

Times an angle by 2. This angle also has the identity: 2sin(Θ)cos(Θ)

Shows the relationship between sine, cosine, tangent, cotangent, secant, and cosecant. For instance, tan(90-x) = cot x

Also known as the “best fit” line, this line best represents the data within a set of data points.

Points plotted on horizontal and vertical axes. Important for finding correlation between values.

Displacement divided by the time interval of the displacement. In other words, the slope of velocity

The rate something changes over a period of time. You can look at it as finding the slope of a series of points.

A line that intersects two or more points on a curve

A line that touches a curve at a point, matching the curves slope there.

The change in the y value divided by the change in the x value

The change in the rate at a particular point or instant. Also known as the derivative.