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]
3 years ago
12

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

Mathematics
1 answer:
garri49 [273]3 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
(girls only) drop ur ig (I’m a girl btw :)))
andriy [413]

Step-by-step explanation:

iiputriii:)

pa brainlist nga po

7 0
2 years ago
I need help with these because recently we have been learning this and I don't get any of this.
Aleksandr-060686 [28]
It is upside down, can't see it properly!
5 0
3 years ago
If you help out can you please explain it so I can understand?
rjkz [21]
Simplify just means put together everything into one big thing. In this case that is just adding. To add a fraction and a decimal we have to convert the fraction into a decimal as well. The decimal form of 1/4 is 0.25, and as such, 3/4 is .75. This means we have -0.75+1.5. Adding a positive to a negative is the same thing as simply subtracting the first number from the second, or 1.5-0.75. This is .75. The answer is C.
8 0
2 years ago
What is 3/ 4 of 6 / 7?
Vika [28.1K]
3/4 of 6/7.    The of means multiplication.

= 3/4  *  6/7.  2 into 4 is 2 and 2 into 6 is 3.
 = 3/2 * 3/7    No other number can divide, so we multiply out.
=9/14

That's the answer.
6 0
3 years ago
Read 2 more answers
What is 2√20 - 4√45 + 7√12 in simplest radical form? show steps pls
miss Akunina [59]
Exact Form:
8√5+14√3

Decimal Form:
6.36016748

8 0
3 years ago
Other questions:
  • Three friends all live
    6·1 answer
  • What number should be added to both sides of the equation to complete the square?<br> x2 - 6x = 5
    9·1 answer
  • Find the midpoint of the line segment with the given endpoints. (-7, -1) and (3, -6)
    13·1 answer
  • PLEASE HELP FREE 30 POINTS IF YOU ANSWER What is 21 1/4% expressed as a fraction?
    9·2 answers
  • PLEASSEEE HELP OMG I WILL DO ANYTHING!!! IM BEGGING
    8·1 answer
  • Pls help need asap !!!
    12·1 answer
  • The number that is ten thousand greater than 645,524 is​
    12·2 answers
  • If f is the function given by f(x)= integral from (4 to 2x) of sqrt(t^2-t)dt then f'(2) =?
    13·2 answers
  • How did the Medieval Church control people's lives?
    7·1 answer
  • Michael has interviewed for two jobs. He feels that he has a 50% chance of getting an offer on Job A and a 60% chance of getting
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!