*NEW* Playlist added below with all relevant HL content

Using the cosine rule:

Converting between radians and degrees:

Graphing a sine function:

Graphing trig functions with phase shifts etc:

Slightly more difficult example:

Slightly more difficult again:

Inverse trig functions – how to graph arcsinx:

Trig identities:

Double angle identities:

Sum identities:

Solving trig identities using quadratic formula:

Finding which quadrant an angle is in:

Factorising to solve trig equations: