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+
+# math-expression-evaluator
+An extremely efficient, flexible and amazing evaluator for Math expression in Javascript.([Documentation](http://redhivesoftware.github.io/math-expression-evaluator/))
+
+## Use cases
+|Input|Result|Explanation|
+|:---:|:---:| --- |
+|**2+3-1**|4| Addition and Subtraction operator |
+|**2\*5/10**|1| Multiplication and Division operator |
+|**tan45** *or* **tan(45)**|1| Trigonometric Function ( tan in Degree mode) |
+|**tan45** *or* **tan(45)**|1.619775190543862| Trigonometric Function ( tan in Radian mode) |
+|**Pi1,15,n** *or* **Pi(1,15,n)**|1307674368000| Product of Sequence |
+|**Sigma1,15,n** *or* **Sigma(1,15,n)**|120| Sum of Sequence( also called summation)  |
+|**2^3**|8| Exponent( note this operator is left associative like MS Office) |
+|**5P3**|60| Permutaion Method to calculate all the permutaions |
+|**sincostan90** *or* **sin(cos(tan(90)))**|0.017261434031253| Multiple functions with or without parenthesis (both works) |
+
+### [Fiddle Yourself](http://jsbin.com/fuyowu/1/edit?html,output)
+
+## Installation
+### Node JS
+ **Using npm** 
+
+    npm install math-expression-evaluator
+
+### Browser
+ **Using bower**
+
+    bower install math-expression-evaluator
+
+### How to run test
+
+    npm test
+
+## Supported symbols
+
+|Symbol|Explanation|
+|:---:|:---:|
+|**+**| Addition Operator eg. 2+3 results 5 |
+|**-**| Subtraction Operator eg. 2-3 results -1 |
+|**/**| Division operator eg 3/2 results 1.5 |
+|**\***| Multiplication Operator eg. 2\*3 results 6 |
+|**Mod**| Modulus Operator eg. 3 Mod 2 results 1 |
+|**(**| Opening Parenthesis |
+|**)**| Closing Parenthesis |
+|**Sigma**| Summation eg. Sigma(1,100,n) results 5050 |
+|**Pi**| Product eg. Pi(1,10,n) results 3628800 |
+|**n**| Variable for Summation or Product |
+|**pi**| Math constant pi returns 3.14 |
+|**e**| Math constant e returns 2.71 |
+|**C**| Combination operator eg. 4C2 returns 6 |
+|**P**| Permutation operator eg. 4P2 returns 12 |
+|**!**| factorial operator eg. 4! returns 24 |
+|**log**| logarithmic function with base 10 eg. log 1000 returns 3 |
+|**ln**| natural log function with base e eg. ln 2 returns .3010 |
+|**pow**| power function with two operator pow(2,3) returns 8 |
+|**^**| power operator eg. 2^3 returns 8 |
+|**root**| underroot function root 4 returns 2 | 
+|**sin**| Sine function |
+|**cos**| Cosine function |
+|**tan**| Tangent function |
+|**asin**| Inverse Sine funtion |
+|**acos**| Inverse Cosine funtion |
+|**atan**| Inverse Tangent funtion |
+|**sinh**| Hyperbolic Sine funtion |
+|**cosh**| Hyperbolic Cosine funtion |
+|**tanh**| Hyperbolic Tangent funtion |
+|**asinh**| Inverse Hyperbolic Sine funtion |
+|**acosh**| Inverse Hyperbolic Cosine funtion |
+|**atanh**| Inverse Hyperbolic Tangent funtion |
+
+## Features  
+
+### Amazing support for Sigma and Pi  
+This is a fantastic feature of this calculator that it is capable of evaluating expressions containing **Sigma and Pi**.  
+Passing `Sigma(1,100,n)` will evaluate to 5050 as n is summationed from 1 to 100.
+and Pi(1,15,n) will evaluate to 1307674368000 as n is multiplied from 1 to 15 which is equal to 15!
+
+### Parenthesis less expression
+If a expression is readable by human then it is readable by this evaluator. There is no need to wrap every function inside parenthesis.
+For eg. sin90 will work totally fine instead of sin(90)
+
+
+##Changelog
+
+### Removed lodash.indexof and used native Array.prototype.indexOf hence dropping suppports for IE8 and below. 
+This will reflect in next release named v1.2.16