# Numbers | Maths with Lemon

Source: https://mathswithlemon.io/ai-geometry-trigonometry-Trigonometric%20equations.html


#### How the unit circle works


##### What you have to know:

- You must know all the basics about cosx, sinx and tanx properties. (If not, check this lesson)
- You must be able to Rearrange Formulae. (If not, check this lesson)

##### Key Points

- 1. Watch the video:
- 2. Read this presentation

#### How to solve trigonometric equations


##### What you have to know:

- The Pythagorean Theorem.

##### Key Points

- 1. Watch the video:
- 2. Solving equation with cosx. Watch the video

#### Trigonometric identity


##### What you have to know:

- The Pythagorean Theorem.

##### Key Points

- 1. Watch the video:
- 2. Read this presentation

#### Area of a triangle


##### What you have to know:

- The Pythagorean Theorem.

##### Key Points

- 1. Watch the video:
- 2. Read this presentation

### IB Past Paper Problems

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