This is an excellent whole lesson on Bearings with the Cosine Rule with resources to teach a subject that is often done poorly in exams. The lesson involves using understanding bearings but also how ...

In this math tutorial, we simplify trigonometric expressions using reciprocal and quotient identities. We demonstrate how to rewrite secant of x as 1 over cosine of x and then simplify sine of x over ...

There are two versions of the cosine rule: Find an unknown side using 𝑎² = 𝑏² + 𝑐² – 2𝑏𝑐 cos𝐴 Find an unknown angle using cos𝐴 = \(\frac{𝑏² + 𝑐² – 𝑎²}{2𝑏𝑐}\) Scientific calculators need to ...