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
olga_2 [115]
3 years ago
12

Find the exact value of : cos(2 arctan(4/3))

Mathematics
1 answer:
QveST [7]3 years ago
7 0
Cos(2 arctan(4/3)) = cos(2 arccos(3/5)) = cos^2(arccos(3/5)) - sin^2(arccos(3/5)) = cos^2(arccos(3/5)) - sin^2(arcsin(4/5)) = (3/5)^2 - (4/5)^2 = 9/25 - 16/25 = -7/25.
You might be interested in
Derrick drove 15 miles at an average rate of 30 miles per hour.
leonid [27]
67 miles lololololol
4 0
2 years ago
An aquarium has the same shape as the solid figure shown below. What is the name of this solid figure?
Butoxors [25]
We need a pic to see what is the shape lol
4 0
3 years ago
Eeeek help, I don’t exactly know how to calculate the width of the missing shape!
Anuta_ua [19.1K]

Answer:

Perimeter = 101.2 cm

Step-by-step explanation:

The given figure has a length of 18 cm and width of 24 cm.  A rectangle of length 8.6cm has been cut out, however, the question is asking to find the perimeter, or distance around the figure.  The overall rectangle still has a perimeter of 18 + 18 + 24 + 24 = 84. However, now it also has two additional sides of 8.6cm each, so 8.6 + 8.6 = 17.2.  

Add all the sides together for perimeter:

84 + 17.2 = 101.2 cm

8 0
3 years ago
Simplify:<br> 2/3 divided by 3 3/4
Nat2105 [25]

Answer:

\frac{8}{45}

Step-by-step explanation:

convert mixed number to improper fractions

3\frac{3}{4} =\frac{15}{4}

\frac{\frac{2}{3} }{\frac{15}{4} }

apply the fraction rule:

\frac{2 * 4}{3 * 15}

multiply the numbers

\frac{8}{45}

3 0
1 year ago
Solve for x. 2x^2-4x=0<br> A. <br> 0, -4<br> B. <br> 0, -2<br> C. <br> 0, 2<br> D. <br> 2, 4
madam [21]

Step-by-step explanation:

2x²-4x=0

2x²=4x

2x=4

x=2

option C

7 0
3 years ago
Read 2 more answers
Other questions:
  • To avoid modeling the physical characteristics of wheel encoders such the square wave outputs, it is desirable to generate encod
    7·1 answer
  • What is the answer i need help
    6·1 answer
  • What is the solution to the equation 4x - 6 = 22
    6·1 answer
  • Find the distance between (-6,6)(-5,-7)
    5·1 answer
  • Why is it important to consider scale when graphing inequalities?
    11·1 answer
  • A swimming pool has a diameter of 32 feet.
    9·1 answer
  • Can someone plzz help me with this 86points
    15·1 answer
  • If cos x= sin(20 + x)° and 0° &lt; x &lt; 90°, the value of xis
    15·1 answer
  • What is 5x83 mentally using distributive property
    7·1 answer
  • Which of the following is true of the values of x and y In the diagram below?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!