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
sineoko [7]
3 years ago
14

HELPPPP Cos x cosy = 1/2(sin (x+y)+ sin (x-y)) true or false

Mathematics
1 answer:
julsineya [31]3 years ago
8 0

Answer:

Step-by-step explanation:

REcall that sin(a+b) = sin(a)cos(b)+cos(a)sin(b). Then

sin(a+b)+sin(a-b) = sin(a)cos(b)+cos(a)sin(b) + sin(a)cos(b) -cos(a)sin(b) = 2sin(a)cos(b). Then

sin(a)cos(b) = (1/2)(sin(a+b)+sin(a-b))

So it is false

You might be interested in
What is 345.432 minus two hundredths ?
Alexandra [31]

Answer:

345.412

Step-by-step explanation:

8 0
2 years ago
Please Help please please
nlexa [21]

Answer:

5.25

Step-by-step explanation:

Take the distance between the two points and divide by 2.

The distance between the two is 10.5 (9.1-(-1.4))

Divide by two to find the midpoint.

6 0
2 years ago
Read 2 more answers
They currently give me 15 euros a week, but I have convinced my parents to raise it for me by 12%. What will be my weekly money
Nina [5.8K]

Answer:

16.80 euros.

Step-by-step explanation:

12% = 0.12

So it will now be 15 + 15 * 0.12

= 16.80.

8 0
3 years ago
Read 2 more answers
If f(x) = x² + 7, what is the value of f(4)? Enter the answer in the box. PLEASE HELP .
bazaltina [42]

Answer:

23

Step-by-step explanation:

With f(4), we plug 4 into the function.

f(4) = 4² + 7

f(4) = 16 + 7

f(4) = 23

7 0
3 years ago
If Jesse cen make 41 jumps in 10 seconds how many can she do in five minutes.
Aleks04 [339]
1230 in five minutes  Just multiply 6 * 41 to get to minutes format, then multiply by five make it five minutes. To get the second answer just divide it by two, which would make it 615.


Hope this helps!
6 0
2 years ago
Other questions:
  • 
The table shows the solution to the equation |2x − 5| − 2 = 3:


    7·2 answers
  • 1/4 as a whole number
    11·1 answer
  • What do u remember about linear realationships on a graph
    11·1 answer
  • I don’t understand please help. WILL GIVE BRAINLY. Zoom in if you can’t see
    6·2 answers
  • All sides of triangle JKL equal 2 units. A transformation maps triangle JKL to triangle J’K’L. The length of side JK is 5 units
    6·1 answer
  • The probability of choosing a rotten apple from the bag of apples is 4/5. Which term best describes this probability
    11·2 answers
  • -1/4 (d + 1) &lt; 2 <br><br> solve the inequality
    10·2 answers
  • Simplify. <br> [(1+5)⋅2−5]⋅2
    11·2 answers
  • Please help. Here's the question.
    9·2 answers
  • Can someone help me “Write a story problem to represent 1/4 divided by 5”
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!