10 to 20%. Trigonometric function occupies a certain proportion in college entrance examination mathematics, but the specific proportion will vary with regions and years. In college entrance examination mathematics, trigonometric functions will appear in multiple-choice questions, fill-in-the-blank questions and solution questions. Multiple-choice questions and fill-in-the-blank questions mainly examine the basic concepts, properties and formula applications of trigonometric functions, while solving problems will involve simplification, evaluation and proof of trigonometric functions.