# Trigonometry e-book Section 04

**Trigonometry the way to do it e-book Section 04**

**SOLVING TRIGONOMETRIC EQUATIONS:**

• **Solving Trigonometric Equations using Pythagorean Identities **

• **Pythagorean Identities**: proofs; worked examples; exercise (with worked answers)

• **Sine Formula for Area of a Triangle**: worked examples

• Solving Simple Trigonometric Equations worked examples

• **Trigonometric Ratios: 30, 60** and **45 degrees**

• **Polar Co-ordinates (r, x) **

• **Compound Angle Formulae**: sin(A + B), sin(A - B), cos(A + B), cos(A -B), tan(A + B) and tan(A - B)

• **Double Angle Formulae**: sin 2A,cos 2A and tan 2A

• (r, a) **Formulae **

• **Exercise** with fully worked answers)

*Item #:*TrigS04