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  2. Trigonometric functions - Wikipedia

    en.wikipedia.org/wiki/Trigonometric_functions

    Basis of trigonometry: if two right triangles have equal acute angles, they are similar, so their corresponding side lengths are proportional.. In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [1] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.

  3. Proportional–integral–derivative controller - Wikipedia

    en.wikipedia.org/wiki/Proportional–integral...

    In many cases, the manipulated variable output by the PID controller is a dimensionless fraction between 0 and 100% of some maximum possible value, and the translation into real units (such as pumping rate or watts of heater power) is outside the PID controller. The process variable, however, is in dimensioned units such as temperature.

  4. Artificial intelligence - Wikipedia

    en.wikipedia.org/wiki/Artificial_intelligence

    The simplest AI applications can be divided into two types: classifiers (e.g., "if shiny then diamond"), on one hand, and controllers (e.g., "if diamond then pick up ...

  5. Universe - Wikipedia

    en.wikipedia.org/wiki/Universe

    A version of the model with a cosmological constant (Lambda) and cold dark matter, known as the Lambda-CDM model, is the simplest model that provides a reasonably good account of various observations about the universe. In this schematic diagram, time passes from left to right, with the universe represented by a disk-shaped "slice" at any given ...

  6. Economics - Wikipedia

    en.wikipedia.org/wiki/Economics

    The earlier term for the discipline was "political economy", but since the late 19th century, it has commonly been called "economics". [22] The term is ultimately derived from Ancient Greek οἰκονομία (oikonomia) which is a term for the "way (nomos) to run a household (oikos)", or in other words the know-how of an οἰκονομικός (oikonomikos), or "household or homestead manager".

  7. Climate change in New Zealand - Wikipedia

    en.wikipedia.org/wiki/Climate_change_in_New_Zealand

    A report released by the Productivity Commission in August 2018 also found that one billion tree plan is only a fraction of what is required to offset the amount carbon being released in New Zealand. The Commission says the planting rate needs to double, from 50,000 hectares to 100,000ha per year and the length of the programme needs to be ...

  8. History of computing hardware - Wikipedia

    en.wikipedia.org/wiki/History_of_computing_hardware

    [disputed (for: The cited source doesn't support the claim, and the claim is misleading.) – discuss] [11] [12] [13] Ramon Llull invented the Lullian Circle: a notional machine for calculating answers to philosophical questions (in this case, to do with Christianity) via logical combinatorics.