{"id":"site-2405/zad/2420","paper_id":"site-2405","number":"2420","points":null,"ptype":"open","subject":"matematyka","category":"zbiory","year":2009,"month":null,"level":"podstawowa","text":"Kąt alfa jest ostry i sin(alfa)=8/9. Wtedy cos(alfa) jest równy A. 1/9 B. 8/9 C. pierwiastek z 17 / 9 D. pierwiastek z 65 / 9","answer":null,"answer_text":null,"solution":null,"image":"img/site/2405/zad-2420.svg","solution_image":"img/site/2405/rozw-2420.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 · 2009 (podstawowa)","subject_label":"Matematyka","category_label":"Zbiory zadań","text_html":"<p>Kąt alfa jest ostry i sin(alfa)=8/9. Wtedy cos(alfa) jest równy A. 1/9 B. 8/9 C. pierwiastek z 17 / 9 D. pierwiastek z 65 / 9</p>","solutions":[{"source":"site","label":"matematykaszkolna.pl","kind":"image","image":"/img/site/2405/rozw-2420.svg"}]}