Legacy SL Booklet 25 - Further Trigonometry | Original PDF

Download Dr Taylan Çeltik’s unchanged original 21-page legacy SL Booklet 25. This is the historical teaching edition, rather than a newly rewritten companion. All original question numbers, mathematical data, equations, diagrams and selected handwritten solutions are retained.

Reference angles and quadrant signs, double-angle identities, trig equations, gradients and composite functions. Paired lessons retain the actual Q25 numbers and tasks.

Included files: the original 21-page booklet PDF and a separate 1-page clarification PDF. Read the notes for the parameter name in Q25-1, tangent at 90°, a worked-scan interval difference and a frequency-sign convention. The last original page contains blank Q25-27 and Q25-28 headings only; it does not include the complete composition question shown in the separate Q25-27 video.

The original includes selected answers and scanned working, not a complete worked-solutions pack. Some inherited scans are softer than typed pages. Historical examination notes do not replace current IB guidance. Follow each video’s current syllabus scope and question references; topics are connected through a spiral learning approach. Digital PDF downloads only.