text: [{"text_idx": "#000003", "text": "Trigonometric Ratios of Some Special Angles"}, {"text_idx": "#000004", "text": "1. Verify the following equalities:"}, {"text_idx": "#000005", "text": "2. Find the value of the following:"}, {"text_idx": "#000006", "text": "3. Verify cos 3A = 4 cos3"}]