Y = Log1 / 2 (SiNx cosx)

Y = Log1 / 2 (SiNx cosx)

(1)f(x)=log1/2(sinx-cosx)
=log(1/2)[√2*sin（x-π/4)]
Because sin (x - π / 4) > 0, (the real number is greater than 0)
So 2K π

It is proved that π / 2 is the period of F (x) = | SiNx | + | cosx |
If you want words, don't draw pictures

Drawing

Given that one root of the equation x-2x + C = 0 about X is = - 1, then the value of C is (), then the original equation can be reduced to (x-3) () = 0

A root of x-2x + C = 0 is = - 1. Take - 1 into the equation (- 1) - 2 (- 1) + C = 0, 1 + 2 + C = 0, and get C = - 3. Then the original equation is x-2x-3 = 0, and the original equation can be changed into (x-3) () = 0, that is, to get x + 1 by cross multiplication

When the gardener uses the scissors as shown in the figure to trim the branches, he often puts the branches as close as possible to the scissors axis O. The purpose of doing this is to ()
A. Increase the resistance arm, reduce the distance of power movement B. reduce the power arm, reduce the distance of power movement C. increase the power arm, save effort D. reduce the resistance arm, save effort

If the branch is close to the scissor axis as far as possible, the resistance arm L2 will be reduced, while the power arm L1 and resistance F2 will remain unchanged, ∵ f1l1 = f2l2, ∵ F1 = f2l2l1 will become smaller, that is, labor saving

The sum of the edges of a cuboid is 96 cm, 10 cm long, 8 cm high and how many cm wide

96÷4-10-8=6

It's about finding rules
Divide a circle into three equal parts, in which there are three numbers. Clockwise, they are 3, 9 and 6. The number of the second circle is 5, 30 and 12. The third circle is 10, (), 3. Find the rule and find the number in brackets

15 see the law 3x6 / 2 = 9 5x12 / 2 = 30 10x3 / 2 = 15

Both positive and negative numbers have the meaning of ()
Due to the worry of the wrong number, it should be: the number of positive and negative numbers have the meaning of ()

Positive and negative numbers can represent two opposite quantities

What are the categories of mathematics

In junior high school, the teacher divided mathematics into algebra and geometry
In high school, the teacher divided mathematics into function, geometry and probability
When I was in college, my teacher turned mathematics into probability theory and mathematical statistics, advanced mathematics, linear algebra and discrete mathematics
Graduate student, I haven't done it yet

39 and 42 common factors

3

Take an example of the length, width and depth of an enterprise's product line

Let's take the simplest Pepsi Cola as an example
Length of product line: Pepsi Cola, 7hi and Mirinda should be regarded as the length of product line, because they are all in the same carbonated beverage industry
In addition to coke, Pepsi has launched Gatorade. Functional drinks, which is the width of the industry
As for coke products, Pepsi not only launched Pepsi Cola, but also further subdivided it into light drink, polar drink and other cola drinks. This is the depth of its product line
Do you understand?