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
Scilla [17]
3 years ago
14

find the exact value of sin a = 4/5, a lies in quadrant 2, and cos B = 2/5, B lies in quadrant 1 find cos(a-b)​

Mathematics
1 answer:
viktelen [127]3 years ago
4 0

Answer:

Cos(a - b) = 0.959

Step-by-step explanation:

We know that:

Sin(a) = 4/5

Such that a is on the first quadrant (between 0° and 90°)

then:

Sin(a) = 4/5

Asin(sin(a)) = Asin(4/5)

a = Asin(4/5) = 53.13°

And:

Cos(b) = 2/5

Then:

Acos(Cos(b)) = Acos(2/5)

b = Acos(2/5) = 36.67°

Then:

Cos(a - b)

where:

a = 53.13° and b = 36.67°

Then:

Cos(a - b) = Cos(53.13° - 36.67°) = 0.959

You might be interested in
10.4 sweets cost 28p altogether,<br> how much much do 7 sweets cost
Serjik [45]
28/10.4=2.69
2.69*7=18.83
7 0
3 years ago
Read 2 more answers
5. The sum of two numbers is 24. Five times the first number minus the second
photoshop1234 [79]

Answer:

6 and 18

Step-by-step explanation:

a+b=24

5a-b=12

5a+a=6a

24+12=36

6a=36 so A on it's own is 6

24-6=b

b=18

hope this helps!

8 0
2 years ago
Read 2 more answers
Dont comment under here if you and just commenting for points.. i really need to pass this:(
Scilla [17]

Answer:

the y intercept is -9/2 or -4 1/2

4 0
3 years ago
How u can convert decimal to a fraction in .23?
Vlada [557]

23

%

=

23

100

=

0.23

First we have to think that the symbol

%

=

1

100

so that

23

%

=

23

⋅

(

1

100

)

this is read twenty three percent is equal to twenty three multiplied by one divided by one hundred.

the result is the fraction

23

100

Now, to convert to decimal, simply divide 23 by 100

23

÷

10

=

2.3


and

2.3

÷

10

=

0.23

this is the same as

23

÷

100

=

0.23

4 0
3 years ago
What number has the same value of 28 tens
iren2701 [21]
The answer is 280 this is your answer
5 0
3 years ago
Read 2 more answers
Other questions:
  • According to the lecture, a valedictory speech should last approximately ________ minutes.
    11·1 answer
  • What is the answer to the equation 4×-5=3×-1?
    5·1 answer
  • After how many places the decimal expansion of 13/40 will terminate?
    6·1 answer
  • Solve -5 + w/3 = -1.
    9·1 answer
  • What is the solution to the system of linear equations represented by the matrix below?
    7·2 answers
  • Mrs. Bennett has a rug that is an equalateral triangle with a perimeter of 12feet. Which could be the length of the sides of the
    11·2 answers
  • Solve x <br><br> 6 - 12x = -54
    6·2 answers
  • Answer for this to question c
    8·1 answer
  • PLEASE HELP! Observe the following quadrilaterals. They each have been labeled with a specific name. Determine if the quadrilate
    6·2 answers
  • A table of data is given.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!