What does Pythagoras' Theorem tell you about these angles: 90°, (45+x)° and (45-x)° in a triangle?
The sine of an angle is equal to the cosine of its complement. Can
you explain why and does this rule extend beyond angles of 90
Shows that Pythagoras for Spherical Triangles reduces to
Pythagoras's Theorem in the plane when the triangles are small
relative to the radius of the sphere.
Explore the properties of combinations of trig functions in this open investigation.
Look at the advanced way of viewing sin and cos through their power series.
Can you work out the equations of the trig graphs I used to make my pattern?
Build up the concept of the Taylor series
Looking at small values of functions. Motivating the existence of
the Taylor expansion.
Draw graphs of the sine and modulus functions and explain the
The family of graphs of x^n + y^n =1 (for even n) includes the
circle. Why do the graphs look more and more square as n increases?