Identifying Trigonometry
These CMEP resources explore the proof and use of trigonometric identities.
Trig Countdown Age 16 to 18
Challenge Level
Challenge Level
A game for one or more players in which you make a target value by building a trig expression
Inspecting Identities liveAge 16 to 18
Challenge Level
Challenge Level
Using trig identities to help sketch graphs of functions
Proving Half-angle Formulae Age 16 to 18
Challenge Level
Challenge Level
Can you find a geometric proof of these half-angle trig identities?
$t$ for tan Age 16 to 18
Challenge Level
Challenge Level
Can you find a geometric proof for some $\tan\theta$ trig identities?
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.