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
Find m<PKL if m<JKP=120° and m<JKL=168°
brilliants [131]

MajshssnayssgsvhahsyswhJusjsjsjJjsjwsjsjssjHhsvsysjwbkekwjwjsjeejwbsjejsywhwhsbennwsbbsbebsuejsksowiwejsudhehevhehhehe

Is your answer

3 0
3 years ago
Laine reads 25 pages in 30 minutes. If she reads 200 pages at the same rate how long will it take her?
Veronika [31]

Answer:

4 hours

Step-by-step explanation:

25 pages -> 30 min

5 pages -> 6 min

200 pages -> 6*40 min =240 min

240/60= 4

Thus, the answer is 4 hours

7 0
3 years ago
-25 - 30 + 2 = pls help
Galina-37 [17]

Answer:

7

Step-by-step explanation:

Do addition first, so 30 plus 2, and then subtract, 32 minus 25. It is seven.

5 0
2 years ago
(7^2)^4= n^8 solve for n
S_A_V [24]

Answer:

n=7

Step-by-step explanation:

(7^2)^4= n^8

We know that a^b^c = a^(b*c)

7^(2*4) = n^8

7^8 = n^8

Since the exponents are the same, the bases must be the same

n=7

4 0
2 years ago
Please help!!!!!!!!!!
Likurg_2 [28]

Answer:

yes

Step-by-step explanation:

1+3=4

4+3=7

7+3=10

and 10+3=13

4 0
3 years ago
Other questions:
  • What is the 7th term in the geometric sequence in which a10 is 9 and a13 is -72?
    13·1 answer
  • Gabe Amodeo, a nuclear physicist needs 60 liters of a 40% acid solution. He currently has a 20% solution and a 50% solution. How
    14·2 answers
  • How many acres does it take to make a mile​
    13·1 answer
  • The distance that a object covered in time was measured and recorded in the table below. What equation describes the motion
    13·2 answers
  • What angle is vertical to angle 2?
    12·1 answer
  • The second hand on a clock is 8cm long why is the distance the tip of the second hand travels in 10 minutes
    15·1 answer
  • What value of X would assure parallelogram ABCD is a rhombus give an angle BRC=7X +6
    14·1 answer
  • Mr. Potter's class will take a test for 1 hours. They need to finish by half past 11 to get to lunch on time.
    8·1 answer
  • Help, i was out sick for most of the week before and didnt learn this materal, i really need help
    11·1 answer
  • PLEASE HELP ASAP <br>are f(x)=4/x-2-1 and g(x)=3/x+2-2 inverses of each other?​
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!