**TRIGONOMETRY VIDEOS**

- How To Come Up With Pythagoras’s Equation From Scratch
- A General Proof Of Why Two Opposite Angles Connected To Parallel Lines Are Equal To One Another
- Simple But Elegant Way To Prove That sin(A+B)=sinAcosB+cosAsinB (Edexcel Proof Simplified)
- sin(A-B)=sinAcosB-cosAsinB Proof – Geometrical
- cos(A+B)=cosAcosB-sinAsinB Explained…
- cos(A-B)=cosAcosB+sinAsinB Proof – Geometrical
- y=arcsinx graph – Related to C3 Mathematics Exams – Edexcel
- y=arccosx graph – Related to C3, C4 Edexcel Exams
- y=arctanx sketch – Related to Edexcel C3 Exams
- How To Come Up with The Cosine Rule From Scratch
- An Alternative Sine Rule Proof – a/sinA = b/sinB = c/sinC
- Areas Of Triangles Formula Transformed
- Areas Of Triangles Used To Produce Sine Rule
- Proving That Opposite Angles Are The Same in 2 Dimensions…