You will be expected to be able to prove a trigonometric identity such as the examples below. In the videos I show you how to set out an identity and what to look for.
Learn the Pythagorean identities below and then try the examples that follow. This is a tricky topic and one that I find students give in too quickly, be patient and it will come. Hopefully this will be a start for you.
- sin2θ + cos2θ ≡ 1
- 1 + tan2θ ≡ sec2θ
- 1 + cot2θ ≡ cosec2θ