Mathematics (2019) Grade(s): 09-12 - Precalculus

MA19.PRE.35

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

Unpacked Content

Knowledge

Students know:
  • Characteristics of an always increasing or always decreasing function.
  • When a function has an inverse that is also a function.

Skills

Students are able to:
  • Identify intervals where the function is increasing or decreasing.
  • Identify the domain of a function that will produce an inverse.
  • Produce different models of functions and their resulting inverse.

Understanding

Students understand that:
  • Due to the periodic nature of trig functions, domains have to be restricted in order to produce a one-to-one relationship.
  • While there are many different intervals that are always increasing or always decreasing, there are conventional choices for the restricted domain of the trig functions.

Vocabulary

  • Restricting the domain
  • Inverse functions
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