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.

The gradient of a straight line segment
The gradient of a straight line segment. In this unit the gradient of a straight line segment is found, and the relationships between the gradients of parallel lines and perpendicular lines are explained.Length: 
The Product Rule
The product rule. This is a special rule that may be used to differentiate the product of two (or more) functions.Length: 
The Quotient rule
The quotient rule. This is a special rule that may be used to differentiate the quotient of two functions.Length: 
The Scalar Product
The scalar product. One of the ways in which two vectors can be combined is known as the scalar product. When the scalar product of two vectors is calculated the result, as the name suggests, is a scalar rather than a vector.Length: 
The sum of an infinite series
The sum of an infinite series. The partial sums of an infinite series form a new sequence. The limit of this new sequence (if it exists) defines the sum of the series. Two specific examples of infinite series that sum to e and pi respectively are described.Length: 
The Vector Product
The vector product. One of the ways in which two vectors can be combined is known as the vector product. When the vector product of two vectors is calculated the result is a vector. The unit includes some geometrical applications.Length: 
Transposition or Rearranging Formulae
It is often useful to rearrange, or transpose, a formula in order to write it in a different, but equivalent form. This video explains what it means to "transpose", the procedure for doing this through simple examples and then shows some more complex examples.Length: 
Triangle Formulae
Triangle formulae. A common mathematical problem is to find the angles or lengths of the sides of a triangle when some, but not all, of these quantities are known. It is also useful to be able to calculate the area of a triangle from some of this information.Length: 
Trigonometric functions
Trigonometric functions. The sine, cosine and tangent of an angle are all defined in terms of trigonometry, but they can also be expressed as functions. How to restrict the domain of each function in order to define an inverse function is also described.Length: 
Trigonometric Functions
Cosec, sec and cot. In this unit we see how the three trigonometric ratios cosecant, secant and cotangent can appear in trigonometric identities and in the solution of trigonometric equations. Graphs of the functions are obtained from a knowledge of sine, cosine and tangent.Length: