# Videos

Choose from over 80 mathematical videos.

Our team of top teacher mathematicians have put together all the important topics and explain them with the types of examples that you would find in a normal textbook or exam.
• #### Trigonometric Identities

Trigonometric identities. In this unit we consider trigonometric identities and how to use them to solve trigonometric equations.
Length: 40 minutes
• #### Trigonometric Ratios in a Right Angled Triangle

Trig ratios in a right angled triangle . Knowledge of the trigonometric ratios of sine, cosine and tangent is vital in very many fields of engineering, science and maths. This unit introduces them and provides examples of how they can be used to solve problems.
Length: 35 minutes
• #### Trigonometric ratios of an Angle of Any Size

Trig ratios of an angle of any size. Knowledge of the trigonometric ratios sine, cosine and tangent is vital in many fields of engineering, maths and science. This unit explains how the sine, cosine and tangent of an arbitrarily sized angle can be found.
Length: 28 minutes
• #### Using a Table of Derivatives

Using a table of derivatives. This video looks at the construction of a Table of Derivatives of common functions using differentiation from first principles. Linearity rules for constant multiples of functions and for sum/difference of two functions, with examples, are explored. The table is extended using the chain rule for differentiation.
Length: 20 minutes
• #### Volumes of solids of revolution

Volumes of solids of revolution. A solid of revolution is obtained by rotating a curve about the x-axis. There is a straightforward technique, using integration, which enables us to calculate the volume of such a solid.
Length: 33 minutes