### Inverse Functions

Inverse Functions The inverse of any function $displaystyle (f)$ is a function that will do the opposite of $displaystyle f$. In other words the function that will undo the effects of $displaystyle f$. So, if $displaystyle f$ maps 4 into 13, then the inverse of $displaystyle f$ will map 13 […]

### Integration by Partial Fraction

Integration by Partial Fraction If the function that need to be integrated is in the form of an algebraic fraction which is not easy to evaluate then you need to write the fraction into partial fraction to make it simpler for integration. You have to remember that this method is done only if the degree […]

### Integration by Parts

Integration by Parts Integration by parts method is used when we want to integrate the product of two functions. When finding the derivative of the product of two functions we use the product rule, and since the integral is the reverse of derivative then integration by parts is the reverse of the product rule. Let’s explain […]

### Methods of Integration

Methods of integrations Basic rules of integration or table of integration help us solve simple problem when the integral is given on standard form. But when the problem is more complicated we need more sophisticated methods like: Integration by Substitutions Integration by Parts Integration by Partial Fraction Decomposition Integration of using some Trigonometric Identities Integration of inverse […]

### Integration by Substitution

Integration by Substitution This method is also called the u-substitution or the reverse of chain rule of derivation. The chain rule except being useful in derivation is also in integration: If we have two functions $displaystyle f(x)$ and $displaystyle g(x)$ then the derivative of their composite function is:$displaystyle (fcirc g{)}'(x)={f}'(g(x)){g}'(x)$. How it helps on integration […]

### Integration Rules

Integration rules We already know that finding an integral is the reverse of finding a Derivative. So firstly you should learn derivates We talked about two types of integral, but a more scientific definition is: Indefinite Integral $displaystyle int{{f(x)dx=F(x)+C}}$ where $displaystyle {F(x)}$ is an antiderivative of $displaystyle {f(x)}$. What is an antiderivative? An antiderivative of […]

### Introduction to Integration

Introduction to Integration What is integration? The process of integration is the reverse of the process of Differentiation. It is labeled by the symbol $displaystyle int{,}$ Integration is used to find areas, volumes and it helps in a lot of other things. One of the most used is in finding the area of an […]

### Derivative Rules

Derivative Rules We know that if $displaystyle y=f(x)$ then the derivative is defined to be $displaystyle f'(x)=underset{{hto 0}}{mathop{{lim }}},frac{{f(x+h)-f(x)}}{h}$ Some notions we use when we write the derivative are: $displaystyle y’=f'(x)=frac{{df}}{{dx}}=frac{{dy}}{{dx}}$ Determining the derivative of a function using the definition sometimes it  requires a lot of work and it’s easy to make mistakes so […]

### Theorems on Limits

Theorems on Limits It can be rather tedious to apply the $displaystyle varepsilon$ and $displaystyle delta$ limit test to individual functions. By remembering some basic theorems about limits we can avoid the some of this repetitive work. We shouldn’t forget that if a limit exists it is always unique.  “The Uniqueness of a Limit” […]

### Introduction to Limits

Introduction to Limits Numerical and Graphical approach to limits Numerical Approach Let’s take a function f(x) and see how the values of the functions change when x takes values closer to a specific number. Example: Let f(x)=3x+1 and calculate f(x) as x takes values closer to 1, but not exactly the value at 1. We first […]

### The Limit of a Function

The limit of a function Let f be a function and let c be a real number. We do not require that f be defined ar c but we do require that f be defined at least on a set of the form (c-p,c) U (c,c+p) with p>0). To say that $displaystyle underset{{xto c}}{mathop{{lim }}},f(x)=l$ is […]