{"id":"site-4005/zad/4007","paper_id":"site-4005","number":"4007","points":null,"ptype":"open","subject":"matematyka","category":"zbiory","year":2013,"month":null,"level":"rozszerzona","text":"Rozwiąż równanie cos x + cos2x = 0 dla x w <-pi,pi>.","answer":null,"answer_text":null,"solution":null,"image":"img/site/4005/zad-4007.svg","solution_image":"img/site/4005/rozw-4007.svg","topics":null,"page_from":null,"source":"site","answer_source":null,"answer_text_source":null,"solution_source":null,"text_source":"site","source_label":"Matematyka · Zbiory zadań · 2013 (rozszerzona)","subject_label":"Matematyka","category_label":"Zbiory zadań","text_html":"<p>Rozwiąż równanie cos x + cos2x = 0 dla x w &lt;-pi,pi&gt;.</p>","solutions":[{"source":"site","label":"matematykaszkolna.pl","kind":"image","image":"/img/site/4005/rozw-4007.svg"}]}