The book "21st Century Simultaneous Equations" develops a standard method (sered) to solve simultaneous equations, whether linear or non-linear, algebraic or trigonometric. It also includes the development of 3D trigonometry, determinants, matrices and vectors. The book provides solutions by spreadsheet and contains many worked examples. This is book 3 in the series of 5 books. Further information can be found on the website https: mcrfocus.co
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