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
Anna007 [38]
3 years ago
14

Find sin(a+b) if tan(a)=7/24 where a is in the third quadrant

Mathematics
1 answer:
ludmilkaskok [199]3 years ago
8 0
The complete question in the attached figure

we have that
tan a=7/24    a----> III quadrant
cos b=-12/13   b----> II quadrant
sin (a+b)=?

we know that
sin(a + b) = sin(a)cos(b) + cos(a)sin(b<span>)
</span>
step 1
find sin b
sin²b+cos²b=1------> sin²b=1-cos²b----> 1-(144/169)---> 25/169
sin b=5/13------> is positive because b belong to the II quadrant

step 2
Find sin a and cos a
tan a=7/24
tan a=sin a /cos a-------> sin a=tan a*cos a-----> sin a=(7/24)*cos a
sin a=(7/24)*cos a------> sin²a=(49/576)*cos²a-----> equation 1
sin²a=1-cos²a------> equation 2
equals 1 and 2
(49/576)*cos²a=1-cos²a---> cos²a*[1+(49/576)]=1----> cos²a*[625/576]=1
cos²a=576/625------> cos a=-24/25----> is negative because a belong to III quadrant
cos a=-24/25
sin²a=1-cos²a-----> 1-(576/625)----> sin²a=49/625
sin a=-7/25-----> is negative because a belong to III quadrant

step 3
find sin (a+b)
sin(a + b) = sin(a)cos(b) + cos(a)sin(b)
sin a=-7/25
cos a=-24/25
sin b=5/13
cos b=-12/13
so
sin (a+b)=[-7/25]*[-12/13]+[-24/25]*[5/13]----> [84/325]+[-120/325]
sin (a+b)=-36/325

the answer is
sin (a+b)=-36/325

You might be interested in
A baby pool is shaped like a short, wide cylinder and holds 52 ft3 of water. A medium pool measures 4 times the height and width
timama [110]

Answer:

D.\ 3328\ ft^3

Step-by-step explanation:

Given

Volume of baby pool = 52ft³

Required

Determine the volume of the medium pool

Volume of a cylinder is calculated as:

V = \pi r^2h

Hence, the volume of the baby pool is:

\pi r^2h = 52

where r and h are the radius and height of the baby pool

Represent the height and radius of the medium pool as H and R

From the given parameters in the question

H = 4 * h and R = 4 * r

H = 4 h and R = 4  r

The volume of the medium cylinder is calculated as

Volume = \pi R^2H

Substitute 4h for H and 4r for R

Volume = \pi (4r)^2(4h)

Open bracket

Volume = \pi (4r) * (4r) * (4h)

Volume = \pi 16r^2 * (4h)

Volume = \pi 16r^2 * 4h

Collect like terms

Volume = \pi r^2 * h * 4 * 16

Volume = \pi r^2  h * 64

Recall that \pi r^2h = 52

So, the expression becomes

Volume = 52 * 64

Volume = 3328

Hence, the medium pool can hold 3328ft^3 of water

3 0
3 years ago
y=x^2-8x+6 complete the square to determine the vertex and maximum or minimum value. Determine the number of x-intercepts.
Irina18 [472]

Answer:

Below in bold.

Step-by-step explanation:

y = x^2-8x+6

y = (x - 4)^2 - 16 + 6

y = (x - 4)^2 - 10

So the vertex is at (4, -10)

The coefficient of x^2 of this function is 1 ( positive) so there will be  a minimum value.

Minimum value = -10.

x-intercepts:

(x - 4)^2 - 10 = 0

(x - 4)^2   =   10

x -  4 =  +/- √10

x =  4 +/- √10

- therefore there are 2 x-intercepts.

6 0
2 years ago
Circle O, with center (x, y), passes through the points A(0, 0), B(–3, 0), and C(1, 2). Find the coordinates of the center of th
balandron [24]
The answer:

the main formula of the circle's equation is 
(x-a)²+ (y-b)² = R²
where C(a, b) is the center of the circle
R is the radius

if a point A(x', y') passes through the circle, so the equation of the circle can be written as 
(x'-a)²+ (y'-b)² = R², and that is  a main formula.


<span>Circle O, with center (x, y), passes through the points A(0, 0), B(–3, 0), and C(1, 2), so we have exactly three equation:
</span>
(0-x)² + (0-y)² = R², circle O passes through A
x²+y²= R²
(-3 -x)² + (0-y)² = R², circle O passes through B
(-3 -x)² + (y)² = R²
(1-x)² + (2-y)² = R², circle O passes through A
(1-x)² + (2-y)² = R²

and we know that R= OA = OC= OB, 
OA=R= sqrt( (0-x)² + (0-y)² ) = OB = sqrt((-3 -x)² + (0-y)²), this implies

x²+y² = (-3 -x)² + (0-y)² , it implies x² = 9+ x² + 6x , and then -9/6=x, x= -3/2
and when OA = OC
x²+y² =(1-x)² + (2-y)²  so, x²+y² =1+x²-2x +4+y²-4y, therefore -5= -2x -4y
 -5= -2x -4y, when x = -3 /2   we obtain y = 2

the center is C(-3/2, 2)
7 0
3 years ago
Show how to solve 378*6 using place value with regrouping. Explain how you knew when to regroup.
SpyIntel [72]
<span>To regroup 378 x 6, you must first establish the place values of each digit. 3 has a place value of 300, because it is in the hundreds column; 7 has a place value of 70 because it is in the tens column; 8 has a place value of 8 because it is in the units column. This means you can regroup 378 x 6 as (300 x 6) + (70 x 6) + (8 x 6). This makes 2,268. </span>
7 0
3 years ago
A section of a tessellated plane is shown. Which type of symmetry does the tessellated plane have?
White raven [17]

Answer:

glide reflection

Step-by-step explanation:

I hope this helps

7 0
3 years ago
Other questions:
  • A carpenter worked for 4 days to finish a repair job. She charged $825 for 15 hours plus $278 for material. What is the carpente
    12·2 answers
  • Can I get help with 15. Please help me and show work
    5·1 answer
  • Mental math 5×395=5×(_ - _)step by step how do you solve this problem?
    8·1 answer
  • Find the sum of the first 20 terms of the sequence -7, -3, 1,…
    11·1 answer
  • PLEASE HELP
    10·1 answer
  • At first, the ratio of Dave's savings to Sam's savings was 5:4. After each of them donated $40 to charity, the ratio of Dave's s
    5·1 answer
  • What is the equation in point-slope form for the line parallel to y=3x-3 that contains P(-4,7)?
    13·1 answer
  • Tanya’s gross pay this pay period is $2,100. She is expecting $300 to come out for taxes and insurance. What should her net pay
    11·1 answer
  • Imma dumb<br>snnanemdnxmxhsjdbfj<br>point giveaway go​
    13·2 answers
  • Can someone please help me I really need this I will give Brainleasit
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!