## Precalculus (6th Edition)

$\cos \left( -\dfrac {\pi }{8}\right) =\cos \dfrac {\pi }{8}$
$\sin \left( \dfrac {5\pi }{8}\right) =\cos \left( \dfrac {\pi }{2}-\dfrac {5\pi }{8}\right) =\cos \left( -\dfrac {\pi }{8}\right) =\cos \dfrac {\pi }{8}$
The text passage contains trigonometric identities and equations but does not present a specific mathematical question or problem to solve. It provides a series of equalities and transformations involving trigonometric functions.
no_question
Given a text passage, determine:
    1. If it contains a mathematical question (including word problems or calculations)
    2. If an answer to that mathematical question is provided in the text

First, describe the content structure you found in 1-2 sentences.

Then provide your analysis in the following format:
TYPE: <one of the following values>
- NO_QUESTION
- SINGLE_QUESTION
- SINGLE_QUESTION_WITH_ANSWER
- MULTIPLE_QUESTIONS
- MULTIPLE_QUESTIONS_WITH_ANSWERS
system
## Precalculus (6th Edition)

$\cos \left( -\dfrac {\pi }{8}\right) =\cos \dfrac {\pi }{8}$
$\sin \left( \dfrac {5\pi }{8}\right) =\cos \left( \dfrac {\pi }{2}-\dfrac {5\pi }{8}\right) =\cos \left( -\dfrac {\pi }{8}\right) =\cos \dfrac {\pi }{8}$
user
The text passage contains trigonometric identities and equations but does not present a specific mathematical question or problem to solve. It provides a series of equalities and transformations involving trigonometric functions.

TYPE: NO_QUESTION