A-level Maths

Lecturer explores fundamental trigonometric identities, starting with Pythagorean trigonometry (sin²θ + cos²θ = 1) from GCSE, derived using a unit circle and right triangle. They then define reciprocal trig functions and expand upon the initial identity to derive two more: cot²θ = cos²θ and tan²θ = sin²θ/cos²θ. Subscribe to @AxiomTutoringCourses for more advanced trigonometry lessons.

In this A-level trigonometry video, we delve into the essential compound angle formulae. You'll learn how to state the formulae for sine and cosine of sums and differences of angles. We'll explore how the odd and even properties of sine and cosine functions allow us to derive new expressions. This video will equip you to understand and derive formulae for sine, cosine, and tangent of A plus B and A minus B. Subscribe to @AxiomTutoringCourses for more A-level math tutorials.

Welcome to the third video in our A-level trigonometry series, where we build upon compound angle formulae. In this session, we will derive and understand the double angle formulae for sine, cosine, and tangent. We will explore how to express sine of 2x as 2 sine x cos x, and uncover the three distinct forms of the cosine of 2x identity. Subscribe to @AxiomTutoringCourses