Let me help you summarize the learning routines of trigonometric functions, solid geometry, series, conic curves, functions and derivatives.

Whether you are a freshman or about to face the college entrance examination, this strategy is proper, and I hope it can bring you useful information ~

Mathematics learning mainly involves two aspects: one is mathematical knowledge, and the other is mathematical methods.

The examination of mathematics is to examine the ability to solve different mathematical problems by using appropriate mathematical methods and combining the learned mathematical knowledge under different types of questions.

So there are three keys to learning mathematics well: learning knowledge, grasping problems and refining methods.

The focus of this paper is to realize different methods for different types of questions through specific examples. (I don't list the basic knowledge here, so I must pay attention to accumulation in my usual study. ) Learning mathematics is a process of summing up and solving problems. There are trigonometric functions, solid geometry, series, conic curves, functions and derivatives in the college entrance examination. Each question type has a corresponding problem solving routine, and each routine has a corresponding problem solving method: a trigonometric function.

There are two methods to test trigonometric function, among which 10%~20% probability is to test trigonometric function, and 80%~90% probability is to test trigonometric function itself.

1. Solving triangles

No matter what the topic is, you must understand that you have only learned three formulas to solve triangles-sine theorem, cosine theorem and area formula.

Therefore, to solve the problem of triangle and find the area, we must use the area formula. As for when to use sine and when to use cosine, it doesn't matter if you can't judge quickly.

2. Trigonometric function

And then solve the need. Routines usually give a complicated formula, and then ask questions about the definition range, range, period, frequency and monotonicity of this function. The solution is to simplify the formula with "one and a half times the sum difference". Simplify: