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By 1970, a calculator could be made using just a few chips of low power consumption, allowing portable models powered from rechargeable batteries. The first handheld calculator was a 1967 prototype called Cal Tech, whose development was led by Jack Kilby at Texas Instruments in a research project to produce a portable calculator. It could add ...
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The first scientific calculator that included all of the basic ideas above was the programmable Hewlett-Packard HP-9100A, [5] released in 1968, though the Wang LOCI-2 and the Mathatronics Mathatron [6] had some features later identified with scientific calculator designs.
The Persian version of Wikipedia was started in December 2003. As of February 2025, it has 1,029,456 articles, 1,373,276 registered users, and 95,882 files, and it is the 19th largest edition of Wikipedia by article count, and ranks 22nd in terms of depth among Wikipedias.
The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement. It is the only system of measurement with official status in nearly every country in the world, employed in science ...
The method used when two sides and their included angle were given was essentially the same method used by 13th century Persian mathematician Naṣīr al-Dīn al-Ṭūsī in his Kitāb al-Shakl al-qattāʴ (Book on the Complete Quadrilateral, c. 1250), [20] but Al-Kashi presented all of the steps instead of leaving details to the reader: