1、 Trigonometric function problem

注意归一公式、诱导公式的正确性【转化成同名同角三角函数时，套用归一公式、诱导公式(奇变、偶不变;符号看象限)时，很容易因为粗心，导致错误!一着不慎，满盘皆输!】。

Pay attention to the correctness of the normalization formula and induction formula [when transforming into a trigonometric function with the same name and the same angle, when applying the normalization formula and induction formula (odd change and even unchanged; the symbol looks at the quadrant), it is easy to make mistakes due to carelessness! If you are careless, you will lose everything!].

二 导数

Second derivative

导数这一部分可能大部分考生都觉得很难，做大题永远最不对，但其实对于导数的题是有快速直接的方法解答的

The derivative part may be difficult for most candidates, and it is always the wrong to do big questions, but in fact, there is a fast and direct way to solve the derivative questions

将要求的那个a放到一边，其他的都放到另一边，然后对另外一边的式子求导，求范围，进而求出a的范围。

Put the required a on one side and the others on the other side, and then derive the formula on the other side, find the range, and then find the range of A.

三 向量

Three vector

一般高考试卷中关于向量的题就是平行垂直关系与点乘，这两个考点不算很难，解答的过程就是靠公式，所以只要记牢公式就行。

In general, the questions about vectors in college entrance examination papers are parallel and vertical relationship and point multiplication. These two test points are not very difficult. The solution process depends on the formula, so just remember the formula.

四 不等式

Four inequalities

在不等式里唯一有难点的就是“均值不等式”。

The only difficulty in the inequality is the "mean inequality".

在高考中也经常会出现这样的题型：如果X＞0，y＞0，且 x+y=1,则 1/x+9/y的最小值为——。这种题乍一看比较混乱，因为没有办法凑，但其实只要把1换成x+y,9换成9（x+y）就可以了。

In the college entrance examination, such questions often appear: if x > 0, Y > 0, and X + y = 1, the minimum value of 1 / x + 9 / y is -. At first glance, this kind of problem is confusing because there is no way to get together, but in fact, it is only necessary to replace 1 with x + y and 9 with 9 (x + y).

五 立体几何

Five dimensional geometry

在高考中如果出现立体几何的题，一定要画“辅助线”，至于是怎样画，要根据题目给出的已知和设问。

In the college entrance examination, if there are three-dimensional geometry questions, we must draw "auxiliary lines". As for how to draw, we should ask questions according to the known and given questions.

六 数列

Six sequence

关于高考数列就两种情况：

There are two situations about the college entrance examination series:

一是an=n

One is an = n

二是an=你就是看不懂。

Second, an = you just can't understand.