certify vs determine

certify

verb
  • To attest to (a fact) as the truth. 

  • To attest that a product, service, organization, or person has met an official standard. 

  • To authenticate or verify in writing. 

determine

verb
  • To ascertain definitely; to figure out, find out, or conclude by analyzing, calculating, or investigating. 

  • To resolve (to do something); to establish a fixed intention; to cause (something) to come to a conclusion or decision; to lead. 

  • To fix the form or character of; to shape; to prescribe imperatively; to regulate; to settle. 

  • To fix the course of; to impel and direct; with a remoter object preceded by to. 

  • To bring to a conclusion, as a question or controversy; to settle authoritative or judicial sentence; to decide. 

  • To set the boundaries or limits of. 

  • To define or limit by adding a differentia. 

  • To bring to an end; to finish. 

How often have the words certify and determine occurred in a corpus of books? (source: Google Ngram Viewer )