**Description of math functions in Excel VBA**

Below I present the names and descriptions of all standard math functions in Excel VBA. As you can see, functions like **VBA RND** don’t need arguments. Functions like **VBA ROUND **require 2 arguments – the value and the number of decimal places to which you will round your value. Numbers with decimal places in VBA are entered using a dot “.”, not a comma “,”.

Function | Description |

ABS () | Returns the absolute value of a number |

EXP () | The function returns an exponential value. For example, EXP (1) will return an Euler number ~ 2.71828182845905 |

FIX () | Returns an integer result. Rounds up for negative numbers. |

INT () | Like FIX () returns an integer result. Rounds down for negative numbers. |

LOG() | Returns the logarithm of the argument |

RND () | Returns a random number in the range <0; 1> |

ROUND () | Rounds a number to x decimal places |

SQR () | The root of the argument |

SGN () | Returns the sign of a number, so 1, -1, or 0 |

SIN () | Trigonometric sine function |

COS () | Cosine trigonometric function |

TAN () | Trigonometric tangent function |

ATN () | Arcustangent trigonometric function |

**VBA mathematical functions – an example of use**

Time to test our math functions. Let’s create a simple program that enters the results of all mathematical functions into the cells of a spreadsheet.

Sub FunExample () Range ("A1"). Value = Abs (-1.651) Range ("A2"). Value = Exp (1) Range ("A3"). Value = Fix (4.98) Range ("A4"). Value = Int (4.84) Range ("A5"). Value = Log (4) Range ("A6"). Value = Rnd (123.123) Range ("A7"). Value = Round (123.123, 1) Range ("A8"). Value = Sqr (4) Range ("A9"). Value = Sgn (-123) End Sub

Below the use of **trigonometric functions**:

Sub FunExample () Range ("A10"). Value = Sin (0) Range ("A11"). Value = Cos (0) Range ("A12"). Value = Tan (0) Range ("A13"). Value = Atn (1) End Sub

If you like to use VBA math functions in conjunction with worksheet functions, I invite you to the next parts of VBA course. You will learn how to use VBA to call any mathematical function from an Excel spreadsheet.

**Tasks (You can enter the solution in the comment)**

3.1 Convert the number 33,445 to an integer. Try using three different functions for this.

3.2 For the number -21, write the VBA code, in which you will calculate absolute value, square root, and round to 3 decimal places. Finally, multiply the number by 5.

3.3 For the ambitious: Given the tangent function, calculate the cotangent function of π / 4.

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