High School · Trigonometric Functions

CCSS.MATH.CONTENT.HSF.TF.A.4

(+) Use the unit circle to explain symmetry (odd and even) and periodicity of trigonometric functions.

Read this standard on the official Common Core site

Lessons that teach this standard

• Graphing Tangent and the Reciprocal Trig Functions

  Graph y = tan x with its period π and vertical asymptotes, and the reciprocal functions secant, cosecant and cotangent built from sine and cosine.

• The Unit Circle: Sine and Cosine for Every Angle

  Why the right-triangle definition stops at 90°, how the unit circle replaces it, the exact values at π/6, π/4 and π/3, and why sine and cosine repeat.