- Side length of a triangle
This calculator computes side length of a triangle given two sides and angle between them (law of cosines)

- 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

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

- Spearman's correlation coefficient
Calculates Spearman's rank correlation coefficient

- 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

- Student t-distribution
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.

- Sunrise and sunset time
This online calculator is intended for sunrise and sunset time calculation for given place and date. The calculator algorithm is obtained from the great book of Oliver Montenbruck and Thomas Pfleger "Astronomy on the Personal Computer".

- Symbol frequencies table
This online calculator builds symbol frequency table for a given message

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

Construction of a sine wave with the user's parameters

- Telecommunications traffic, Erlang
The calculator gives telecom traffic in Erlang for given time span and total call duration.

- The calculation of amortization for tax purposes
The methods and procedures for calculating amortization for tax purposes in accordance with Article 259 of the Tax Code, taking into account the changes to the federal law of 27 July 2006 N 144-FZ.

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

- The limit of the function at the given point
This calculator calculates the limit of the function at a given point numerically. It calculates the limit of the function well as x approaches to the specified value. It's not suitable for calculating the limits when x goes to infinity.

- Tidal gate calculator (Rule of twelfths)
This calculator calculates tidal gates using the rule of twelfths, estimating the height of the tide at any time, given only the time and height of high and low water.

- Tilted cylindrical tank volume
Calculates volume of cylindrical tank tilted at an angle. To perform calculation you must provide the tank size, angle and liquid level.

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

- Triangle angles for given triangle sides
This calculator computes triangle angles for given triangle sides using cosine law

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