# Edexcel A Levels Core Maths 3 (C3)

Unit C3: Core Mathematics 3

A2 compulsory unit for GCE Mathematics and GCE Pure Mathematics Mathematics

We are excited to present to you the C3 maths in a pretty unique manner.

The complete C3 teaching videos are unique. It is in the form of teaching by examples. The examples are carefully chosen and taught to you in such a way as to cover the entire C3 syllabus. They reflect examination questions and their standards.

It is concise, precise and all example driven. This may yet prove to be a more efficient, faster way for you to learn C3 and will especially be helpful to those without additional maths background and for those who fear maths.

We are confident you will do well in the C3 using these videos.

Module 1 Algebra and functions - Edexcel Core Maths 3 (146:37 mins)

Simplification of rational expressions including factorising and cancelling, and algebraic division.

Denominators of rational expressions will be linear or quadratic, eg $$\dfrac{1}{ax + b^{\prime}}$$

$$\dfrac{ax + b}{px^2 + qx + r} , \dfrac{x^3 + 1}{x^2 - 1}$$ .

Definition of a function. Domain and range of functions. Composition of functions. Inverse functions and their graphs.

The concept of a function as a one-one or many-one mapping from $$\mathbb{R}$$ (or a subset of $$\mathbb{R}$$) to $$\mathbb{R}$$. The notation $$f : x\mapsto$$ and $$f(x)$$ will be used.

Students should know that $$fg$$ will mean 'do $$g$$ first, then $$f$$'.

Students should know that if $$f^{−1}$$ exists, then $$f^{−1}f(x) = ff^{−1}(x) = x$$.

The modulus function.

Students should be able to sketch the graphs of $$y = \lvert ax + b \rvert$$ and the graphs of $$y = \lvert f(x) \rvert$$ and $$y = f(\lvert x \rvert)$$, given the graph of $$y = f(x)$$.

Combinations of the transformations $$y = f(x)$$ as represented by $$y = af(x)$$, $$y = f(x) + a$$, $$y = f(x + a)$$, $$y = f(ax)$$.

Students should be able to sketch the graph of, for example, $$y = 2f(3x)$$, $$y = f(−x) + 1$$, given the graph of $$y = f(x)$$ or the graph of, for example, $$y = 3 + \sin 2x$$,

$$y = −\cos \left(x + \dfrac{\pi}{4}\right)$$.

The graph of $$y = f(ax + b)$$ will not be required.

Unit 1 Algebra and functions - Edexcel Core Maths 3 PDF
Unit 2 Algebra and functions - Edexcel Core Maths 3 Video
Module 2 Trigonometry - Edexcel Core Maths 3 (155:10 mins)

Knowledge of secant, cosecant and cotangent and of arcsin, arccos and arctan. Their relationships to sine, cosine and tangent. Understanding of their graphs and appropriate restricted domains.

Knowledge and use of $$\sec^2 \theta = 1 + \tan^2 \theta$$ and $$cosec^2 \theta = 1 + \cot^2 \theta$$.

Angles measured in both degrees and radians.

Knowledge and use of double angle formulae; use of formulae for $$\sin (A ± B)$$, $$\cos (A ± B)$$ and $$\tan (A ± B)$$ and of expressions for $$a \cos \theta + b \sin \theta$$ in the equivalent forms of $$r \cos (\theta ± a)$$ or $$r \sin (\theta ± a)$$.

To include application to half angles. Knowledge of the $$t (\tan \frac{1}{2} \theta )$$ formulae will not be required.

Students should be able to solve equations such as $$a \cos \theta + b \sin \theta = c$$ in a given interval, and to prove simple identities such as $$\cos x \cos 2x + \sin x \sin 2x ≡ \cos x$$.

Unit 1 Trigonometry - Edexcel Core Maths 3 PDF
Unit 2 Trigonometry - Edexcel Core Maths 3 Video
Module 3 Exponentials and logarithms - Edexcel Core Maths 3 (65:11 mins)

What students need to learn:

The function $$e^x$$ and its graph.

To include the graph of $$y = e^{ax + b} + c$$.

The function $$\ln x$$ and its graph; $$\ln x$$ as the inverse function of $$e^x$$.

Solution of equations of the form $$e^{ax + b} = p$$ and $$\ln (ax + b) = q$$ is expected.

Unit 1 Exponentials and logarithms - Edexcel Core Maths 3 PDF
Unit 2 Exponentials and logarithms - Edexcel Core Maths 3 Video
Module 4 Differentiation - Edexcel Core Maths 3 (70:04 mins)

What students need to learn:

Differentiation of $$e^x, \ln x, \sin x, \cos x, \tan x$$ and their sums and differences.

Differentiation using the product rule, the quotient rule and the chain rule.

Differentiation of $$cosec x, \cot x$$ and $$\sec x$$ are required. Skill will be expected in the differentiation of functions generated from standard forms using products, quotients and composition, such as $$2x^4 \sin x, \dfrac{e^{3x}}{x}, \cos x^2$$ and $$\tan^2 2x$$.

The use of $$\dfrac{dy}{dx} = \dfrac{1}{\left(\dfrac{dx}{dy}\right)}$$.

Eg finding $$\dfrac{dy}{dx}$$ for $$x = \sin 3y$$.

Unit 1 Differentiation - Edexcel Core Maths 3 PDF
Unit 2 Differentiation - Edexcel Core Maths 3 Video
Module 5 Numerical methods - Edexcel Core Maths 3 (55:50 mins)

What students need to learn:

Location of roots of $$f(x) = 0$$ by considering changes of sign of $$f(x)$$ in an interval of $$x$$ in which $$f(x)$$ is continuous.

Approximate solution of equations using simple iterative methods, including recurrence relations of the form $$x_{n+1} = f(x_n)$$.

Solution of equations by use of iterative procedures for which leads will be given.

Unit 1 Numerical methods - Edexcel Core Maths 3 PDF
Unit 2 Numerical methods - Edexcel Core Maths 3 Video

** Our syllabus is current and updated to 2018