1、 Trigonometric function problem

注意歸一公式、誘導(dǎo)公式的正確性【轉(zhuǎn)化成同名同角三角函數(shù)時，套用歸一公式、誘導(dǎo)公式(奇變、偶不變;符號看象限)時，很容易因為粗心，導(dǎo)致錯誤!一著不慎，滿盤皆輸!】。

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 導(dǎo)數(shù)

Second derivative

導(dǎo)數(shù)這一部分可能大部分考生都覺得很難，做大題永遠最不對，但其實對于導(dǎo)數(shù)的題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

將要求的那個a放到一邊，其他的都放到另一邊，然后對另外一邊的式子求導(dǎo)，求范圍，進而求出a的范圍。

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

一般高考試卷中關(guān)于向量的題就是平行垂直關(guān)系與點乘，這兩個考點不算很難，解答的過程就是靠公式，所以只要記牢公式就行。

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

在不等式里唯一有難點的就是“均值不等式”。

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

在高考中也經(jīng)常會出現(xiàn)這樣的題型：如果X＞0，y＞0，且 x+y=1,則 1/x+9/y的最小值為——。這種題乍一看比較混亂，因為沒有辦法湊，但其實只要把1換成x+y,9換成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 立體幾何

Five dimensional geometry

在高考中如果出現(xiàn)立體幾何的題，一定要畫“輔助線”，至于是怎樣畫，要根據(jù)題目給出的已知和設(shè)問。

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 數(shù)列

Six sequence

關(guān)于高考數(shù)列就兩種情況：

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.