- Simple math in any numeral system
This online calculator supports simple math (addition, subtraction, division, multiplication and power) for numbers expressed in any numeral system - binary, octal, hexadecimal, from the base 2 to base 36

- Sine wave
Construction of a sine wave with the user's parameters

- Solution of a system of 3 linear equations
Solution of a system of 3 linear equations with 3 variables

- Solution of nonhomogeneous system of linear equations using matrix inverse
Solution of nonhomogeneous system of linear equations using matrix inverse

- Solution of quadratic equation
Solution of quadratic equation, including complex roots

This online calculator find a solution to the question how to fill tank with certain amount of water using two buckets of different size

- Solving limit problems using L'Hospital's Rule
Solving 0/0 and ∞/∞ limit problems using L'Hospital's Rule.

- Sphere
- Spherical cap and spherical segment
This calculator computes volume and surface area of spherical cap and spherical segment

- Spherical sector
Calculates surface area and volume of Spherical sector by radius and height

- Surface area of a cube

Calculates cumulative distribution function value and probability density function value for Student t-distribution. Quantile calculator evaluates Student quantiles for given probability and specified number of degrees of freedom.

- Tank volume
Calculator computes tank volume given its length, diameter and walls depth. Created by user's request.

- The diagonals of a parallelogram
Calculator computes the diagonals of a parallelogram and adjancent angles from side lengths and angle.

- The greatest common divisor and the least common multiple of two integers
This calculator finds the greatest common divisor (GCD) and the least common multiple (LCM) of two integers

- The greatest common divisor of two integers
This calculator determines the greatest common divisor of two integers using Euclidean algorithm

- Tips and tricks #8: How to reuse existing calculator
This article describes process of reusing another calculator's logic (algorithm) in your calculator.

- Torus
Volume and surface area of torus.

- Total square
This calculator calculates total square as sum of squares of entered rectangles

- Total volume
This calculator calculates total volume as sum of volumes of entered rectangular parallelepipeds.

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