The term "the formulae" refers to a set of mathematical expressions or instructions used to solve a problem or calculate a result. Synonyms for "the formulae" include mathematical equations, mathematical formulas, algebraic expressions, mathematical models, and mathematical functions. These terms can be used interchangeably depending on the context and subject matter, and they all refer to the same basic idea of using mathematical concepts and principles to solve problems and make calculations. Whether you are working with algebraic equations, trigonometric functions, or calculus formulas, the term "the formulae" describes the fundamental building blocks of mathematical analysis and problem solving.