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
IceJOKER [234]
3 years ago
13

If cosA = 3/5 and A ∈ (630,720), find sin2A

Mathematics
1 answer:
Sergio039 [100]3 years ago
5 0

Answer:

- \frac{24}{25}

Step-by-step explanation:

Given 630 < A > 720 then A is in the fourth quadrant where

cosA > 0 and sinA < 0

Given

cosA = \frac{3}{5} = \frac{adjacent}{hypotenuse}

Then the triangle is a 3- 4 - 5 with opposite side 4, thus

sinA = - \frac{opposite}{hypotenuse} = - \frac{4}{5}

Using the trigonometric identity

sin2A = 2sinAcosA

         = 2 × - \frac{4}{5} × \frac{3}{5}

         = \frac{2(-4)(3)}{5(5)} = - \frac{24}{25}

You might be interested in
Ralph is 3 times as old as Sara. In 6 years, Ralph will be only twice as old as Sara will be then. Find Ralph's age now. If x re
inessss [21]
<span>ralph = r sara = s ralph is TODAY, 3 times older, so if sara is "s" old, ralph is 3s r = 3s in 6 years, ralph will be 2 times as old as sara THEN, in 6 years ralph will be TODAY's age plus 6, so r + 6 so if sara is "s" old, r+ 6 = 2s r + 6 = 2s</span>
4 0
3 years ago
Read 2 more answers
Pls explain how to do this will give brainliest to best answer
Delicious77 [7]

Answer:

1st Graph:

Add all the numbers (Do the same to 2nd Graph)

Then add

answer will be shown

5 0
3 years ago
Does this represent a function?<br><br> y^2 = 16 – 4x^2
slega [8]
It’s not a function because when it’s graphed put it doesn’t pass the vertical line test
4 0
3 years ago
I need help please as soon as possible with both :(
Over [174]

Answer:

X=0

(8,7)

Step-by-step explanation:

8 0
3 years ago
Alex made a sketch for a poster contest. The sketch measures 4 in. × 5 in. The scale factor from the sketch to the finished post
leonid [27]
<span>4*5/2 = 10
5*5/2 = 25/2 = 12/5 

The poster is 10 x 12.5 inches. </span>
3 0
3 years ago
Other questions:
  • What is the volume of a rectangular prism that has a length, width, and height of 12 m, 14 m, and 23 m, respectively?
    15·1 answer
  • Combine the like terms to make a simpler expression:<br> -n + (-3) + 3n +5
    9·1 answer
  • Solve for m<br><img src="https://tex.z-dn.net/?f=g%20%3D%204cm%20-%203m" id="TexFormula1" title="g = 4cm - 3m" alt="g = 4cm - 3m
    11·1 answer
  • 59.67÷11.1 what's the answer show me the work
    10·1 answer
  • Suppose you want to estimate the proportion of cars that are sport utility vehicles (SUVs) being driven in Kansas City, Missouri
    8·1 answer
  • Tan^-1[-squareroot3/3] what is the degree
    11·2 answers
  • Who can answer this ??
    13·2 answers
  • A. 2miles<br> B.200 miles<br> C.6 miles <br> Please help
    5·1 answer
  • 8. Determine the product of each. Write your answer as a fraction; remember to reduce the fraction. the question is in the photo
    15·1 answer
  • the ratio of the length of an arc of the circle to the circumference of the circle is 3:7, if the diameter of the circle is 14cm
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!