Identifying Trigonometry

Identifying Trigonometry

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

Trig Countdown 

Age 16 to 18 Challenge Level:
A game for one or more players in which you make a target value by building a trig expression

Inspecting Identities live

Age 16 to 18 Challenge Level:
Using trig identities to help sketch graphs of functions

Proving Half-angle Formulae 

Age 16 to 18 Challenge Level:
Can you find a geometric proof of these half-angle trig identities?

$t$ for tan 

Age 16 to 18 Challenge Level:
Can you find a geometric proof for some $\tan\theta$ trig identities?