- Inverse of a matrix
Calculating inverse matrices via adjugate matrix

- Inverse trigonometric functions
This calculator determines values of inverse trigonometric functions (arcsine, arccosine, arctangent, arccotangent, arcsecant, arccosecant) and outputs it with different measurement units (degrees, radians, minutes, etc)

- Involute of an angle
Involute of an angle calculator and finding an angle by the given involute.

- Julian and Gregorian calendars
Julian and Gregorian calendars date conversion

- Julian Day
Calculation of Julian day for given date plus some information about it

- Kinematics. The Equations for Uniform Acceleration
This calculator will help you to solve uniform acceleration problems

Kinematics problem from the Svetozarov's book for MEPI matriculates

- Laminate flooring. The calculation of the number of planks
The calculation of the number of planks requiered

- Least Common Denominator for several fractions
Least Common Denominator for several fractions

- Lengths of triangle sides given one side and two angles
This online calculator determines lengths of triangle sides given one side and two angles

- Level of liquid in the cylindrical tank, AKA Quarter-Tank Problem
This online calculator finds the height above the bottom of a horizontal cylinder (such as a cylindrical gas tank) to which the it must be filled for it to be full at specified percentage (for example, one quarter full amounts)

- Levenshtein Distance
Online calculator for measuring Levenshtein distance between two words

The calculator checks LL1 grammar correctness, parses a text using the grammar, shows FIRST, FOLLOW and FIRST PLUS sets, parsing tree and gives PLANETCALC parsing code.

- Linear Diophantine equations
This calculator solves linear diophantine equations.

- Liquid level in the tilted cylinder
Сalculates the level of the liquid in a tilted cylindrical tank with the tank parameters and the liquid volume.

- Loan payment example
- Logarithm
This online calculator outputs logarithm of a number to a given base, as well as natural logarithm and common (decadic) logarithm

- Luhn algorithm
Calculates digit sequence checksum using Luhn algorithm (mod 10), calculates validation digit (the digit to be appended to the digit sequence to make whole sequence ckecksum equal to zero).

- Math equation simplification
Simplifies math equation with single variable (x). In eqation you may also use integer and fractional numerical constants arithmetic operations, trigonometric and hyperbolic functions.

- Math equation syntax
Math equation samples.

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