# Identifying Trigonometry

### Identifying Trigonometry

These CMEP resources explore the proof and use of trigonometric identities.

### Trig Countdown

##### Stage: 5 Challenge Level:
A game for one or more players in which you make a target value by building a trig expression

### Inspecting Identitieslive

##### Stage: 5 Challenge Level:
Using trig identities to help sketch graphs of functions

### Proving Half-angle Formulae

##### Stage: 5 Challenge Level:
Can you find a geometric proof of these half-angle trig identities?

### $t$ for tan

##### Stage: 5 Challenge Level:
Can you find a geometric proof for some $\tan\theta$ trig identities?