Transformation, also known as transformation, refers to the mathematical idea of transforming unknown, unfamiliar and complex problems into known, familiar and simple problems through deduction and induction, so that the problems can be solved smoothly. Mathematical theories such as trigonometric function, geometric transformation, factorization, analytic geometry, calculus, and even the ruler of ancient mathematics are permeated with transformation ideas. Common transformation methods include: general special transformation, equivalent transformation, complex simple transformation and so on.