202 1 national mathematics 1 question 6 points, the first question 12 points. When solving problems, we usually turn abstract, unfamiliar and complex problems into simple and concrete problems, such as finding the maximum value of a function.

Answers to big math questions in college entrance examination

First, the trigonometric function problem

Pay attention to the correctness of normalization formula and induction formula (when transforming into trigonometric function with the same name and the same angle, apply normalization formula and induction formula (singular change, even invariance; When symbols look at quadrants, it is easy to make mistakes because of carelessness. One false move may lose the game. )。