Basic Trigonometry (Lower Sec)

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Trigonometry is an area of mathematics that studies relationships involving lengths and angles of triangles. It introduces functions of angles called trigonometric functions and is applicable to many areas involving periodic phenomena, such as astronomy and engineering. This document provided a brief introduction to trigonometry and wished readers a happy adventure exploring this area of math.

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• We wish you a happy Math adventure with Trigo!

High-frequency welding is included in a group of resistance welding process variations that use high-frequency welding current (1kHz to 800kHz) to concentrate the welding heat at the desired location. The heat produces the coalescence of metals, and an upsetting force usually is applied to produce a forged weld. High-frequency resistance welding is an automated process and is not adaptable to manual welding. High-frequency resistance welding was developed during the late 1940s and early 1950s to fill the need for high-integrity butt joints and seam welds in pipe and tubing. But today the process is also used in the manufacture of products such as spiral-fin boiler tubes, closed roll form shapes, and welded structural beams. A wide range of commonly used metals can be welded, including low-carbon and alloy steels, ferritic and austenitic stainless steels, and many aluminum, copper, titanium, and nickel alloys. HFW is based on two main electrical phenomena Skin effect Proximity effect

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