Trigonometric Functions
Overview
Beyond right-angled triangles, the sine, cosine and tangent become functions you can graph for any angle. Their graphs are smooth, repeating waves, and recognising their shape lets you read off values and solve trigonometric equations.
In this lesson (Extended tier) you will recognise, sketch and interpret the graphs of y = sin x, y = cos x and y = tan x for 0 to 360 degrees, and solve trigonometric equations over that range.
Objectives
- Recognise, sketch and interpret the following graphs for 0° ⩽ x ⩽ 360°: y = sin x, y = cos x, y = tan x.
- Solve trigonometric equations involving sin x, cos x or tan x, for 0° ⩽ x ⩽ 360°.
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Trigonometric Functions. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- What is the maximum value of y = sin x? A. 0 B. 1 C. 90 D. 360 Answer: B
- What is the value of cos 90°? A. 1 B. 0 C. -1 D. 0.5 Answer: B
- Over what interval does y = sin x repeat? A. 90° B. 180° C. 360° D. 720° Answer: C
- How many solutions does sin x = 0.5 have for 0° ⩽ x ⩽ 360°? A. 0 B. 1 C. 2 D. 4 Answer: C
- The second solution of sin x = 0.5 (besides 30°) in 0° to 360° is: A. 60° B. 150° C. 210° D. 330° Answer: B
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