6 videos
2 skills
We'll now see that we can express the sin(a+b) and the cos(a+b) in terms of sin a, sin b, cos a, and cos b. This will be handy in a whole set of applications.

Applying angle addition formula for sin

VIDEO 5:20 minutes

Angle addition formula with cosine

VIDEO 6:12 minutes

Another example using angle addition formula with cosine

VIDEO 7:14 minutes

Sine of non special angle

VIDEO 8:35 minutes

Cosine addition identity example

VIDEO 5:14 minutes

Double angle formula for cosine example

VIDEO 3:28 minutes

Addition and subtraction trig identities

PRACTICE PROBLEMS
Computing expressions using trig addition and subtraction identities

Applying angle addition formulas

PRACTICE PROBLEMS