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
artcher [175]
3 years ago
10

Which of the following are identities?

Mathematics
1 answer:
frosja888 [35]3 years ago
4 0

Answer:

A and D.

Step-by-step explanation:

(sin(x-y))/(cosxcosy)

(sinxcosy - cosxsiny) / cosxcosy

=  sinx / cosx - siny/cosy

= tanx - tany.  

So A is an identity.

B.   (sin(x+y))/(sinxsiny)

= sinx cosy + cosx siny / sinxsiny

= cosy/siny + cosx/sinx

= 1/tany + 1/tanx which is not identical with 1-tanxtany.

C.  tan ( x - pi/4) =    ( tan x - 1) / (1 + tanx) : - not identical to tanx - 1.

D.  cos( x + (pi/6) = cosxcos(pi/6) - sinxsin(pi/6)

     =    0.866cosx - 0.5sinx

    - sin(x - (pi/3) = -(sinxcos(pi/3) - cosxsin(p/3))

     =   - (0.5sinx - 0.866cosx0

     = 0.866cos x - 0.5sinx.

which are identical.

You might be interested in
Please I need help step by step
zaharov [31]
To find the surface area, you need to do the following:
A side of the figure is a trapezoid, so you should do 13+5x7 (since there are 2 of the same sides there is no need to divide by two.) and it should equal 126. To find the area of the top of the figure, you need to do 5x2 which equals 10. The area of the bottom of the figure is 26 (13x2), then do 2x3x2 to get the sides on the left and right of the figure. After all of this, add them together. (126+10+26+12=174.)
The surface area should be 174mm.
6 0
3 years ago
(3 3/4) divided by (-2 1/2)
GalinKa [24]

Answer:

-1 1/2

same as -1.5 but since you are dealing with fractions you should put it in fraction form unless told otherwise.

3 0
3 years ago
Find the value of x. Explain your reasoning. (5x − 12) + (x + 6) = because the consecutive angles of a parallelogram are . Solvi
Verizon [17]

Answer:

x=1

Step-by-step explanation: Snap Add?

I don't know what this means:

"because the consecutive angles of a parallelogram are . Solving for x gives x ="

I know that (5x-12) + (x+6)

1. 5x-12+x+6=0

2.6x-6=0

3.6x=6

4.x=1

6 0
3 years ago
Which table represents a linear function
katrin2010 [14]

Answer:

the forth one is linear

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Please help me !! pls pls pls
frutty [35]

Answer:

aas congruence postulate

6 0
2 years ago
Other questions:
  • A square pyramid with a height of 7 inches has volume of 47.25 cubic inches. Find the side length of the square base
    6·1 answer
  • The City Zoo has different admission prices for children and adults. When three adults and two children went to the zoo, the pri
    5·1 answer
  • what matrix is a result of m x h enter your answer by filling in the boxes enter any fractions as simplified fractions​
    10·1 answer
  • Camden is taking a multiple choice test with a total of 50 points available. Each question is worth exactly 5 points. What would
    10·1 answer
  • Circle A is congruent to circle J. Chords BC, CF, EG, KL, LO, and MP are congruent.
    6·2 answers
  • What is the product of –12 and –4? –48 –16 16 48?
    10·2 answers
  • 3(x−1) + 7=11 what is x
    10·2 answers
  • Can any help with it<br>​
    10·2 answers
  • In what order were the following energy sources discovered by humans ?
    11·2 answers
  • The hanger image below represents a balanced equation
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!