1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alborosie
3 years ago
7

If cos (A+B) = cosAcos B – sinAsin B , find the value of cos 75

Mathematics
1 answer:
kirill [66]3 years ago
4 0

Answer:

Step-by-step explanation:

Cos 75 = Cos ( 30 + 45)  {Use Cos (A + B) identity}

            = Cos 30*cos 45 - Sin 30 Sin 45

            = \frac{\sqrt{3}}{2}*\frac{1}{\sqrt{2}}-\frac{1}{2}*\frac{1}{\sqrt{2}}\\\\= \frac{\sqrt{3}}{2\sqrt{2}}-\frac{1}{2\sqrt{2}}\\\\=\frac{\sqrt{3}-1}{2\sqrt{2}}\\\\=\frac{(\sqrt{3}-1)*\sqrt{2}}{2\sqrt{2}*\sqrt{2}}\\\\=\frac{\sqrt{3}*\sqrt{2}-\sqrt{2}}{2*2}\\\\=\frac{\sqrt{6}-\sqrt{2}}{4}

You might be interested in
Ile to 2 +2 nie piszcze nic tylko sprawdzam
Bumek [7]

Answer:

Could you rewrite this question in english so we can understand what is being asked? Thank you!

Step-by-step explanation:

6 0
4 years ago
Can y’all help me on question 20?!
denis23 [38]

Answer:

yes I can help you but ???

8 0
3 years ago
Read 2 more answers
Which graph represents the solution set of the system of inequalities? {y&lt;−3x−2y<br> y≤x−2
irina1246 [14]

Answer:

Option 1

Step-by-step explanation:

In each inequality we have the equation of a line.

The first step in solving this problem is to identify each line in the figures.

To do this, we willient your cut points.

y = x-2

We do y = 0

0 = x-2

x = 2. This line cuts the x-axis at x = 2.

Now we do x = 0

y = -2.

This line cuts the y-axis in y = -2.

Now we can identify this line in the figure.

The inequality is:

y≤x - 2

Then the region that represents this inequality are all the points below the line y = x-2 and also those that belong to the line.

Try for example the point (0, -4) that is below this line.

-4≤0-2

-4≤-2. The inequality is met.

We do the same for the other line:

y<-3x - 2

y = -3x-2.

The cut points are:

2 = -3x

x = -2 / 3

y = -2

Locate in the graphs the line that meets these characteristics.

The region understood by this inequality are all points below the line

y = -3x-2 and which, in turn, are below the line y = x-2.

Once again, the point (-4.0) complies with both inequalities.

Identify these characteristics in the options, and you will see that the correct option is the first

4 0
3 years ago
Read 2 more answers
the radius of the base of a right cylinder is 12 cm and the height and the height of the cylinder is 18 cm. in terms of pi what
sladkih [1.3K]

Answer:

Step-by-step explanation:r=12cm,h=18cm,v=?

Vol. Of a cylinder=Πr²h

V= Π×12²×18

V= Π×144×18

V=2592Πcm³

7 0
3 years ago
4. Which is the better value? Show your work and explain your choice.
Tems11 [23]
Option B


I think its opinion B because its cheaper
3 0
3 years ago
Other questions:
  • Luis earns a base salary of $150.00 every week with an additional 14% percent commission on everything he sells. Luis sold $6050
    10·1 answer
  • Priya has a recipe for banana bread she uses 7 1/2
    12·2 answers
  • What is the axis of symmetry and vertex for the function f(x) = 3(x – 2)2 4?
    13·2 answers
  • Graph each equation y=4x-1
    8·1 answer
  • Infiniti sells 8 different models of cars, with 5 different trim levels and 5 color choices. What is the total amount of options
    9·1 answer
  • Find the values of x and y.
    7·1 answer
  • 1. What statement describes the relationship between the graph of the equation y = −|x| and the graph of the equation y = −|x| −
    10·1 answer
  • How many permutations are there of the letters in the following​ word, if all the letters are used without​ repetition?
    8·1 answer
  • QUESTION 4:<br> Find all missing angles.
    14·1 answer
  • What is the slope of this line? 4 34 −34 −3 Number graph ranging from negative 5 to 5 on both the x and y axis. A line passes th
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!