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

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

- Sound Speed in Gases
This online calculator computes speed of sound in an ideal gas.

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

- 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.

- Sun position at a given date. Azimuth and elevation table.
Calculation of azimuth and elevation of the sun above the horizon for a given position and time. Table with one hour increments.

- Sunrise and sunset calculator
Sunrise/Sunset calculation for given latitude and longitude or for given city. Source: Almanac for Computers, 1990 published by Nautical Almanac Office United States Naval Observatory Washington, DC 20392

- 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".

- Surface area of a cube
- Surface tension. Weight and volume of the drop of liquid
This online calculator calculates the weight and the volume of the drop given the surface tension, diameter of the capillary tube, and density of the liquid

- 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.

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

- Temperature scales
Conversion between different temperature scales

- The basal metabolic rate
This calculator computes BMR calories

- The buoyant force
This calculator computes the buoyant force and weight of the liquid displaced, given the volume of body in water

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

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