1 out of 3
Complex numbers can be represented graphically using an Argand diagram. This problem explains more...
1 out of 3
In this problem, we define complex numbers and invite you to explore what happens when you add and multiply them.
1 out of 3
An arithmetic progression is shifted and shortened, but its sum remains the same...
3 out of 3
Build series for the sine and cosine functions by adding one term at a time, alternately making the approximation too big then too small but getting ever closer.
1 out of 3
Can you work out the natural time scale for the universe?
1 out of 3
2 out of 3
A red square and a blue square overlap. Is the area of the overlap always the same?
1 out of 3
Given a regular pentagon, can you find the distance between two non-adjacent vertices?
1 out of 3
Can you find ways of joining cubes together so that 28 faces are visible?
