Edexcel IAL P1 (May 2025) - Question 4 Walkthrough (Trig Graphs)Solving |Edexcel IAL Pure 1 May 2025
Автор: Math & Physics with Mr. Divi
Загружено: 2025-10-04
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Описание:
Struggling with trigonometry graphs and equations? In this video, I provide a full, step-by-step walkthrough of Question 4 from the May 2025 Pearson Edexcel International Advanced Level (IAL) Pure Mathematics 1 (P1) paper (WMA11/01).
We'll break down this 6-mark question on the graph of y = 4cos(x), which tests your understanding of coordinates, periodicity, and solving trigonometric equations over large intervals.
📚 In this video, you'll learn how to:
Find key coordinates on a cosine graph (Parts a & b).
Solve trigonometric equations like
4
cos
x
=
3
4cosx=3 and
5
+
4
cos
x
=
1
5+4cosx=1.
Calculate the number of solutions over very large intervals (up to 18,000 degrees!) by understanding the graph's period.
Avoid common mistakes with interval notation and boundary values.
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