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
kozerog [31]
2 years ago
13

For the following problem, assume that all given angles are in simplest form, so that if A is in QIV you may assume that 270° &l

t; A < 360°. If sin ( A ) = − 1/3 with A in QII then find cos A/2.
Mathematics
1 answer:
d1i1m1o1n [39]2 years ago
3 0

Answer:

Step-by-step explanation:

Given that angle A is in IV quadrant

So A/2 would be in II quadrant.

sin A = -1/3

cos A = \sqrt{1-sin^2 A} =\frac{2\sqrt{2} }{3}

(cos A is positive since in IV quadrant)

Using this we can find cos A/2

cosA = 2cos^2 \frac{A}{2} -1\\Or cos \frac{A}{2} =-\sqrt{\frac{1+cosA}{2} } =-\sqrt{\frac{3+2\sqrt{2} }{6} }

You might be interested in
Which expression shows how to convert 60 hours to days​
torisob [31]

Answer

60 hours = 2.5 days

Step-by-step explanation:

1 day = 24 hours

2 days = 48 hours

3 days = 72 hours

so 60 hours in = to 2.5 days

hope this helps

7 0
3 years ago
Read 2 more answers
Please help me find m&lt;1 before 11:59 PM!
Bond [772]

Answer:

129 degrees

Step-by-step explanation:

add the interior angles: 62 + 67 = 129

subtract your answer from 180 to get the exterior angle of the interior angle that is opposite to the given angles

4 0
3 years ago
Read 2 more answers
The dot plots below show the ages of students belonging to two groups of music classes:
kolbaska11 [484]

Answer:

Step-by-step explanation:

8

4 0
1 year ago
Read 2 more answers
Please help me solve. Surface area of this pyramid?
Sever21 [200]

Answer:

4,784ft^2

Step-by-step explanation:

Well in this case we will just use the square and triangle area formulas instead of the pyramid surface area formula.

So if the base is a square then the area is 32*32 which is 1,024.

Now for the trangle, the area of a triangle b*h/2.

So b*h is 47*32 which is 1,504.

So 1,504/2 is 752.

So 752 is the area of 1 triangle and we have 4 so 5*752 is 3,760.

So 3,760 + 1,024 is 4,784.

So the total SA if the pyramid is 4,784ft^3.

6 0
3 years ago
Read 2 more answers
Tell me that answer for the question
artcher [175]

Answer:

15cm

Step-by-step explanation:

17+17=34

64-34=30

30 divided by two is 15

6 0
3 years ago
Read 2 more answers
Other questions:
  • How do I solve 13.65=h+4.88 it’s stupid I know but I need help!!
    14·1 answer
  • Can anyone help me asap plzz.
    12·2 answers
  • P2-16p+48=0 Please solve this math problem
    12·1 answer
  • 0.56 yards of rope are cut Into 8 equal lengths. How long will each piece be after they are cut
    14·1 answer
  • O
    7·1 answer
  • What is 8x squared plus 2x
    10·2 answers
  • On a 540-mile trip, cheng and Elsie shared the driving
    7·1 answer
  • If a pattern starts with one and doubles each term(1,2,4,8,16...) what is the algebraic pattern rule from y(term value) to x(ter
    13·1 answer
  • PLEASE HELPP MEEE QUICK
    11·1 answer
  • Enter the coordinates for this 90 degree counter clockwise rotation around the origin.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!