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
Tanzania [10]
4 years ago
12

Cos xcos y=1/2(sin(x+y)+ sin(x-y))

Mathematics
1 answer:
garri49 [273]4 years ago
7 0

Taking Rhs

1/2 [sin(x+y)+ sin (x-y)]

using sinA + sin B = 2 cos (A+B)/2 cos( A - B)/2

1/2 [ 2 Cos ( x+y+x-y)/2 . Cos (x+y-x+y)/2]

=Cos 2x/2. Cos 2y/2 = Cos x . Cos y

Hence true

You might be interested in
Factor: 28k^3-24k^2+49k-42<br><br> I will give Brainliest to the first person :)
serious [3.7K]

Answer:

(4k^2+7)(7k+6)

Step-by-step explanation:

1. group the first two terms (28k^3-24k^2). The greatest common factor is 4k^2. If you factor that out you get 4k^2(7k-6)

2.When you group the last two terms (49k-42). you can factor out a 7.

7(7k-6).

3. There is a (7k-6) in both sections so you can combine all the terms.

4k^2(7k-6) 7(7k-6) becomes (4k^2)(7k-6)

7 0
3 years ago
25.6 % of what number is 21.12 ?
otez555 [7]

Answer:

The value of number is 82.5

Step-by-step explanation:

Given as :

Let The number  = x

∴ 25.6 % of x = 21.12

Or, 25.6 × x = 21.12 × 100

Or, 25.6 × x = 2112

∴   x = \frac{2112}{25.6}

i.e x = 82.5

Hence 25.6 % of 82.5 is 21.12  So , The value of number is 82.5  Answer

7 0
4 years ago
Helpp i’m confused !!!!
pshichka [43]

Answer:

2

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
What is the domain?<br> What is the range?
almond37 [142]

Answer:

The domain of a function is the set of all possible inputs for the function. For example, the domain of f(x)=x² is all real numbers, and the domain of g(x)=1/x is all real numbers except for x=0. We can also define special functions whose domains are more limited.

The range is the difference between the largest and smallest numbers. The mid range is the average of the largest and smallest number.

Hope this helps!

8 0
3 years ago
What is the explicit rule for 2, 0, -2, -4?
vodomira [7]

Answer:Take away 2 for each number

Step-by-step explanation: 2-2=0-2=-2-2=-4

7 0
3 years ago
Other questions:
  • Write the number equal to 2 tens and 15 ones
    5·2 answers
  • Last year, Goran biked 384 miles. This year he biked c miles, using c write an expression for the total number of miles he biked
    6·2 answers
  • How many cubes with side lengths of 1/4 CM does it take to fill the prism
    11·1 answer
  • Determine if the ordered pair provided is a solution to the linear system: Yes, (4, 0) is a solution to the system. The system h
    10·1 answer
  • 152/600, 104/600,136/600,208/600 as decimals
    7·1 answer
  • Will mark as brainliest if you get the right answer :P
    14·1 answer
  • 1. You have $10 saved. Each week you receive $5 in allowance. Let x represent the number of weeks you
    12·2 answers
  • Kelly sells vitamins. She made this chart to calculate her total earnings for the month of April.
    13·1 answer
  • Which is the best estimate for the length of a lady bug?
    9·1 answer
  • Please help ASAP!!!!!
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!