text: ## Precalculus (6th Edition)
  
  $\cos \left( -\dfrac {\pi }{8}\right) =\cos \dfrac {\pi }{8}$
  $\sin \left( \dfrac {5\pi }{8}\right) =\cos \left( \dfrac {\pi }{2}-\dfrac {5\pi }{8}\right) =\cos \left( -\dfrac {\pi }{8}\right) =\cos \dfrac {\pi }{8}$
explanation: The text extract appears to be from a precalculus textbook, specifically dealing with trigonometric identities. It contains a series of equations and identities involving cosine and sine functions, but it does not contain a question or an explicit answer to a question.
distilabel_metadata.content: Evaluate the user given text extract and determine if it contains a math question and optionally and answer to this question.
  
  Output rules:
  
  1. Briefly describe the document and mention if it contains a question or a question and answer.
  2. Finalize the output with: Label: no-question,question,question-and-answer,multiple-question,multiple-question-and-answer
distilabel_metadata.role: system
distilabel_metadata.content: ## Precalculus (6th Edition)
  
  $\cos \left( -\dfrac {\pi }{8}\right) =\cos \dfrac {\pi }{8}$
  $\sin \left( \dfrac {5\pi }{8}\right) =\cos \left( \dfrac {\pi }{2}-\dfrac {5\pi }{8}\right) =\cos \left( -\dfrac {\pi }{8}\right) =\cos \dfrac {\pi }{8}$
distilabel_metadata.role: user
distilabel_metadata.raw_output_q_a_detector_0: The text extract appears to be from a precalculus textbook, specifically dealing with trigonometric identities. It contains a series of equations and identities involving cosine and sine functions, but it does not contain a question or an explicit answer to a question.
  
  Label: no-question