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# Functions: Trigonometric Functions208 questions11 skills

## HSF-TF.A.1

Understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle.
Skills for this standard are coming soon.

## HSF-TF.A.2

Explain how the unit circle in the coordinate plane enables the extension of trigonometric functions to all real numbers, interpreted as radian measures of angles traversed counterclockwise around the unit circle.
Skills for this standard are coming soon.

## HSF-TF.A.3

12 questions1 skill
Use special triangles to determine geometrically the values of sine, cosine, tangent for π/3, π/4 and π/6, and use the unit circle to express the values of sine, cosine, and tangent for x, π + x, and 2π – x in terms of their values for x, where x is any real number.

## HSF-TF.A.4

Use the unit circle to explain symmetry (odd and even) and periodicity of trigonometric functions.
Skills for this standard are coming soon.

## HSF-TF.B.5

58 questions3 skills
Choose trigonometric functions to model periodic phenomena with specified amplitude, frequency, and midline.

## HSF-TF.B.6

18 questions1 skill
Understand that restricting a trigonometric function to a domain on which it is always increasing or always decreasing allows its inverse to be constructed.

## HSF-TF.B.7

73 questions4 skills
Use inverse functions to solve trigonometric equations that arise in modeling contexts; evaluate the solutions using technology, and interpret them in terms of the context.

## HSF-TF.C.8

20 questions1 skill
Prove the Pythagorean identity sin2(θ) + cos2(θ) = 1 and use it to find sin(θ), cos(θ), or tan(θ) given sin(θ), cos(θ), or tan(θ) and the quadrant of the angle.

## HSF-TF.C.9

45 questions2 skills
Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.