In Chapter 2 (Trigonometry), it also covers Sine and Cosine Rules (Laws). Differ to subtopic 2.1 Introduction to Trigonometry where we have learned the idea of SOHCAHTOA.

One major different between SOHCAHTOA and Sine and Cosine Rules is

### SOHCAHTOA vs Sine and Cosine Rules

SOHCAHTOA Sine&Cosine Rules
used to Solve
Right Angle Triangle
(one of the angles
inside the triangle is 90)
used to Solve
Any Triangle
(none of angle is 90)

Sine and Cosine Rules