Sign In
Ask Question
Echo
Mathematics
8 October, 18:11
Find the exact value of Cos 7pie/12
+3
Answers (
1
)
Adrian Webb
8 October, 18:26
0
The value is ((square root 2) - (square root 6)) / 4
Step-by-step explanation:
We can find the value by breaking up the cos (7pi/12) into
cos (4pi/12 + 3pi/12)
This is the same thing as
cos (pi/3 + pi/4)
You can then rewrite that as
cos (pi/3) * cos (pi/4) - sin (pi/3) * sin (pi/4)
Then solve for each value
1/2 * ((square root 2) / 2) - ((square root 3) / 2) * ((square root 2) / 2)
Multiply each value that should be together
((square root 2) / 4) - ((square root 6) / 4)
Common denominators allow the answer to be further simplified to
((square root 2) - (square root 6)) / 4
Comment
Complaint
Link
Know the Answer?
Answer
Not Sure About the Answer?
Find an answer to your question 👍
“Find the exact value of Cos 7pie/12 ...”
in 📗 Mathematics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers
You Might be Interested in
Which of the following are square roots of the number below? check all that apply 81 a. 18 b. - (81) ^1/2 c. 9 d. 81^1/2
Answers (1)
What are some limitations in using a line of best fit drawn on a scatter plot to make predictions? a. There may be too much information given on the scatter plot. b. The line may represent a negative or positive correlation. c.
Answers (1)
Solve for b. b + 3 (3 - 2b) = 1 - 2 (b + 1)
Answers (1)
Consider the function represented by the equation x - y = 3. What is the equation written in function notation, with x as the independent variable? f (x) = y + 3 f (x) = - y - 3 f (x) = - x + 3 f (x) = x - 3
Answers (2)
The sum of (2x^3 - 3x^2 + 4) and which polynomial results in the polynomial (5x^3 + 4x^2 - 1) ? A. (-3x^3 - 7x^2 + 3) B. (3x^3 + x^2 - 3) C. (3x^3 + 7x^2 - 5) D. (7x^3 - x^2 + 3) E. (10x^3 - 12x^2 - 4)
Answers (1)
New Questions in Mathematics
A right triangle has legs that are 19 in. and 23 in. What is the area of the triangle
Answers (2)
What equation results from completing the square and then factoring x2+4x=12
Answers (1)
In two years the value of a car chnaged from 14,000 to 11,200 what is the percent of change
Answers (1)
What is the difference 4 1/3 - (-2/3)
Answers (1)
Elaine is painting a fence. she knows that she needs 1 gallon of paint for each 10 feet of fencing. The fencing will enclose a rectangular yard that is 3 yards long and 2 yards wide. how much paint does Elaine need?
Answers (1)
Home
»
Mathematics
» Find the exact value of Cos 7pie/12
Sign In
Sign Up
Forgot Password?