{"type":"rich","version":"1.0","title":"Trig Identity Proof: Cosine Subtraction","description":"Activity where students arrange the steps to prove the cosine subtraction formula, reviewing substitutions, angle relationships, and simplifications as outlined by standard HSF.TF.C.9.","author_name":"Padlet Arcade","thumbnail_url":"https://arcade.padlet.com/open-graph/social-preview-image.png?timestamp=1775674813576&hashid=aBKQw480jZ","html":"<iframe src=\"https://arcade.padlet.com/embed/aBKQw480jZ\" width=\"720\" height=\"480\" frameborder=\"0\" allowfullscreen></iframe>","width":720,"height":480,"provider_name":"Padlet Arcade","provider_url":"https://arcade.padlet.com"}