1. IB Revision Lesson 2
30°
45°
60°
sin θ
cos θ
tan θ

2. IB Revision Lesson 2
mymaths - sin and cos

3. IB Revision Lesson 2
By sketching graphs, solve these equations for x where 0 ≤ x < 360°
sin x = sin x =
cos x = cos x =
mymaths - tan

4. IB Revision Lesson 2
We can solve equations of the form sin θ = k. Now we will bring in some identities to solve more complicated things.
Dividing by cos to get tan sin2θ + cos2θ = 1
Double angle formulae Equating brackets to 0
(sin x + 1)(4 sin x – 3) = 0 2sin2θ – 3cos2θ = 2

5. IB Revision Lesson 2

6. IB Revision Lesson 2

7. IB Revision Lesson 2
Using GDC