# Partial derivatives

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## Product description

The program is finding the partial derivatives of functions of several variables.

Can variables x, y, z can be x1, x2, x3, x4 or s, l, r

Private and mixed.

Examples of differentiated functions -

1. d (sin (x ^ 2)) / dx = (2 * x) * cos (x ^ 2)

2. d (cos (arctg (2 * x))) / dx = - (2 / ((2 * x) ^ 2 + 1)) * sin (arctg (2 * x))

3. d (ln (x ^ 2)) / dx = (2 * x) / (x ^ 2)

4. d (sin (2 * y * z ^ 2 + z)) / dz = ((2 * y * 2 * z) +1) * cos (2 * y * z ^ 2 + z)

5. d (sin (2 * y * z ^ 2 + z)) / dy = (2 * z ^ 2) * cos (2 * y * z ^ 2 + z)

6. d2 (sin (2 * y * z ^ 2 + z)) / dydz = (4 * z) * cos (2 * y * z ^ 2 + z) - (2 * z ^ 2) * ((2 * y * 2 * z) +1) * sin (2 * y * z ^ 2 + z)

7. d (Pi * r ^ 2) / dr = Pi * 2 * r

8. d (x1 ^ 2 + x2 ^ 2 + x3 ^ 2) / dx2 = 2 * x2

where x ^ n - "X to the power of n"

Functions and Operators.

Variables from "a1 to z9"

Functions: sin (x) - sine

cos (x) - cos

arccos (x) - arc cosine

arcsin (x) - arc sine

tg (x) - Tangent

ctg (x) - katangens

arctg (x) - arctangent

arcctg (x) - arkkatangens

Pi - Pi = 3.14 ...

exp (x) - eksponenta

ln (x) - natural logarithm

E - number exp (1) = 2.71 ...

x ^ 2 - square function

sqrt (x) - the square root

´-´ - Subtraction

´*´ - Multiplication

´/´ - Division

´^´ - The power vovedenie

Also in addition to the file exe-file includes two libraries for Visual Studio - it

Parser.dll and Web.dll. Without them, the program does not start.

You can use them as well for their purposes, for example if you do not like

execution of my program or if you want to improve it, then using these

libraries you can write your program in Visual Studio.

A new version of the program.

The new version can now change the font of the text field where the input function

As the program of adapting under computers with different screen size and resolution, and

within the program, you can resize the windows.

System requirements:

1. Operating System - Windows XP, Vista, Server, Seven 