Find the range of the function y = cos & sup2; x-4sinx_____ . If you know that α + β = 3 / 4 π, what is the value of (1-tan α) × (1-tan β)? Hee hee

Find the range of the function y = cos & sup2; x-4sinx_____ . If you know that α + β = 3 / 4 π, what is the value of (1-tan α) × (1-tan β)? Hee hee

（1 - tanα）* （1-tanβ）
=1- （tanα + tanβ - tanα * tanβ）
∵ Tan (α + β) = - 1 = (Tan α + Tan β) / (1-tan α * Tan β) in the shift
The above formula = 1 - (- 1 + 0)

Mathematics in the first year of junior high school
(x-y)^7*(y-x)^7
2×4^x×8^3=2^20
What is x?

(X-Y) ^ 7 * (Y-X) ^ 7 = (X-Y) ^ 7 * [(- 1) * (X-Y)] ^ 7 = (X-Y) ^ 7 * (- 1) ^ 7 * (X-Y) ^ 7 = - (X-Y) ^ 142 × 4 ^ x × 8 ^ 3 = 2 ^ 20 2 × (2 ^ 2) ^ x × (2 ^ 3) ^ 3 = 2 ^ 202 × 2 ^ 2x × 2 ^ 9 = 2 ^ 202 ^ (1 + 2x + 9) = 2 ^ 20, so 1 + 2x + 9 = 202x = 10x = 5

What is the general term formula of the sequence 4 9 16 25 36

4=2*2
9=3*3
16=4*4
25=5*5
So an = (n + 1) * (n + 1) = (n + 1) ^ 2

How to convert micron and millimeter

1 meter (m) = 100 cm (CM);
1 cm (CM) = 10-2m = 10 mm (mm);
1 mm (mm) = 10-3m = 1000 μ m (UM);
1 micron (UM) = 10-6m = 1000 nm;
1 nm = 10-9m. [virus size is about 100 nm]
Nanometer (nm) = [10-7 to 10-9 cubic meters] = fineness equivalent to mesh unit, about 180000 ~ 1800000 mesh
Micron (UM) = [below - 6 cubic meters of 10] = the fineness is equivalent to the mesh unit, which is less than 18000 mesh. The limit fineness of micron is 18000 mesh
Nanotaxis = micro nanotaxis = [10's - 6 cubic meters] to [10's - 7 cubic meters] = 18000 mesh to 180000 mesh
The volume ratio and differential volume of nano health food powder range from 100 nm to 1000 nm, and the average diameter distribution is above D50
The results showed that the average particle size distribution of nano health food powder was 100 nm and passed D50
Because of the nanometer like fineness, the volume ratio is between 100nm-1000nm, and the particle number ratio is within 100nm, the grinding process with ultra-low temperature cooling will not change the material properties, which is beneficial to human nutrition absorption

To find the formula of linear equation with one variable
X（1+40%）80%-X=15

X*1.4*0.8-x=15
1.12x-x=15
0.12x=15
x=125

Fill in the number according to the rule: - 1 / 2,2 / 5, - 3 / 10,4 / 17. What is the next number and what is the nth number?

-5/26
The nth number
(-1)^n * n/(nn+1)

A section of cylindrical steel is 3 meters long, with a cross-sectional area of 9 square decimeters, and a cubic decimeter weighs 7.8 kg. How heavy is this section of steel

Weight:
3×10×9×7.8
=2106kg

What are the words in unit 10 of PEP?
I wanted to write my calligraphy, but I didn't bring back any books,

grow programmer computer science engineer pilot professional act move dream somewhere artist part-time save at the same time hold rich travel all over retire yet over fax reader fit.

There are two red balls, three white balls and five yellow balls in one pocket. They have the same shape and quality
1. What's the probability of touching the yellow ball? 2. What's the probability of winning if you touch the red ball or the yellow ball

1. The probability of touching the yellow ball is 5 ／ 10 = & # 189;
2. If you touch the red ball or the yellow ball, the probability of winning is 7 / 10

How many meters per mu by how many meters?

Mu is a unit of urban land area in China. One mu is equal to 60 square feet, about 666.67 square meters. Fifteen Mu is equal to one hectare. 60 square feet is chosen because of the counting method in ancient China
In other words, it's 60 feet * 60 feet. Generally speaking, it's just about the area, not about how many meters by how many meters
The size of the Mu varied from Dynasty to Dynasty