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GREYUIT [131]
3 years ago
14

By using sum or difference formulas, cos(π−x) can be written as

Mathematics
1 answer:
Liono4ka [1.6K]3 years ago
8 0

We have cos( x - y ) = cosxcoy + sinxsiny <=> cos ( π - x ) = cosπcosx + sinπsinx <=> cos ( π - x ) = (-1)cosx + 0sinx = -cosx;

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Adrian says that 4(-9)= 36. Why is Adrian incorrect?
xenn [34]

Answer:

4(-9)= -36

Step-by-step explanation:

Since there's a negative on the 9 it will affect the product. So the answer is supposed to be a - 36.

4 0
3 years ago
the sum of two numbers is 3 3/4 if 1/3 of the larger number is 1/2 more than 2/3 of the smaller find the number
Agata [3.3K]
Let us assume the larger number = x
Let us assume the smaller number = y
Then
x + y = 3 3/4
x + y = 15/4
And
x/3 = (2y/3) + 1/2
x = [3 * (2y/3)] + (3/2)
  = 2y + (3/2)
Now putting the value of x from the second equation to the first , we get
x + y = 15/4
2y + (3/2) + y = 15/4
3y = (15/4) - (3/2)
3y = (15 - 6)/4
3y * 4 = 9
12y = 9
y = 9/12
   = 3/4
Now putting the value of y in the first equation, we get
x + y = 15/4
x + (3/4) = (15/4)
x = (15/4) - (3/4)
   = (15 - 3)/4
   = 12/4
   = 3
So the value of x or the larger number is 3 and the value of y or the smaller number is 3/4.
3 0
3 years ago
30 POINTS URGENT! When solving the following system of equations, which variable would be the easiest to solve for?
AnnyKZ [126]

Answer:

b

Step-by-step explanation:

8 0
3 years ago
I don't know what the answer is to divide 180 in a ratio of 4:5:9
Karolina [17]
Hello there,

First you need to add together the numbers.
4+5+9 = 18
Divide the total by this,
180 / 18 = 10
Multiply each number by 10.
40:50:90.

Hope This Helps You!
Good Luck Studying :)
4 0
3 years ago
Read 2 more answers
1/8-(-5+3/4)=x+(-1/4)
-BARSIC- [3]

Answer:

x = 37 /8

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
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