Degree Ceremony

What does Pythagoras' Theorem tell you about these angles: 90°, (45+x)° and (45-x)° in a triangle?

After Thought

Which is larger cos(sin x) or sin(cos x) ? Does this depend on x ?

Small Steps

Two problems about infinite processes where smaller and smaller steps are taken and you have to discover what happens in the limit.

Tangled Trig Graphs

Age 16 to 18 Challenge Level:
What effect does changing the constant $a$ have on the graph $y=\sin(ax)$?