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
Answer two questions about systems A and B
Lunna [17]

Step-by-step explanation:

I dont see any questions

Can you send a picture to see if I can help

7 0
3 years ago
Read 2 more answers
Fractions that if times by 1 half you get more than a half?
allochka39001 [22]

Answer:

See below

Step-by-step explanation:

Only 'improper' fractions would have this result....that is fractions with numerator  >  denominator

5 0
2 years ago
12 subtracted from a negative number is 16. Write as an equation
cupoosta [38]

Step-by-step explanation:

(-x)-12=16

-x=28

x=28

plss mark brainliestttt

7 0
3 years ago
In a certain state, fishing licenses are in the form of LLL NN, where L stands for a letter of the alphabet and N stands for a o
Pavel [41]
<h2>Answer:</h2>

There are 1757600 possibilities.

<h2>Step-by-step explanation:</h2>

In a certain state, fishing licenses are in the form of LLL NN

L stands for a letter of the alphabet (a to z)

N stands for a one-digit number from 0 to 9.

Now, for the series LLL, 3 alphabets are placed that can be any from a to z. This means at each place, 26 letters can be placed.

Similarly, for NN, 2 numbers are placed that can be any, between 0 and 9. At each place 0 to 9 can be placed.

Hence, the total possible outcomes will be :

26\times26\times26\times10\times10=1757600

Therefore the answer is 1757600 possibilities.

5 0
3 years ago
Read 2 more answers
What is the other dimension of the rectangular cross section that is perpendicular to the base (the face that is shaded) and pas
FromTheMoon [43]
The answer is… D. 18
3 0
3 years ago
Other questions:
  • Igloos Unlimited charges $150 per night, with a 50% discount every night after the third night. If you stay for eight nights, ho
    14·1 answer
  • Please help me<br> What is the area of the orange figure? *
    13·2 answers
  • Need help on question 11, A,B,C?
    14·1 answer
  • Plz Help
    10·2 answers
  • In a triangle, the measure of the first angle is twice the measure of the second angle. The measure of the third angle is 88° mo
    10·1 answer
  • |2x|=3 find absolute value equation algebraically
    6·1 answer
  • Can someone help me with this question pls !
    6·1 answer
  • Simplify the expression (3a^4) (-6a^3) 
    7·2 answers
  • URGENT CLICK TO SEE LINKS WILL GET REPORTED PLS
    8·2 answers
  • Find the median and first quartile, Q1,
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!