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
dem82 [27]
3 years ago
5

1-2 sin e cos 20-2 sin 40 = cos (20)

Mathematics
1 answer:
natka813 [3]3 years ago
8 0

Answer:

No this is not the same as cos(2Ф)

Step-by-step explanation:

First I changed the cos^{2}Ф into 1-sin^{2}Ф

I then foiled the (1-2sin^{2}Ф)(1-sin^{2}Ф) and that resulted in 1-sin^{2}Ф-2sin^{2}Ф+2sin^{4}Ф

From there, I then cancelled the two 2sin^{4}Ф and combined like terms and was left with 1-3sin^{2}Ф

Now 1-3sin^{2}Ф ≠ cos(2Ф)

You might be interested in
Which of the following graphs could be the graph<br> of y = -2x +1?
photoshop1234 [79]

Answer:

C

Step-by-step explanation:

Graph C has a negative slope, just like the equation, and the y-intercept is at the point (0,1), just like the equation states.

3 0
2 years ago
Read 2 more answers
Find the shortest side of a triangle whose perimeter is 64 if the ratio of two of its sides is 4:3 and the third side is 20 less
Sergio039 [100]

Answer:

The shortest side of the triangle is 18

Step-by-step explanation:

Let the sides the triangle be x, y and z.

From the question, the perimeter of the rectangle is 64, that is

x + y + z = 64 ...... (1)

Also, the ratio of two of its sides is 4:3, that is x:y = 4:3, then we can write that x/y = 4/3 ⇒ 3x = 4y ...... (2)

The third side, z, is 20 less than the sum of the other two, that is

z + 20 = x + y ...... (3)

Substitute equation (3) into (1)

Then,

z + 20 + z = 64

2z +20 = 64

2z = 64 - 20

2z = 44

z = 44/2 k

z = 22

From equation (3)

z + 20 = x + y

Then, k

22 + 20 = x +y

42 = x + y

x = 42 - y ...... (4)

Substitute this into equation 2

3x = 4y

3(42-y) = 4y

126 - 3y = 4y

4y + 3y = 126

7y = 126

y = 126/7

y = 18

Substitute this into equation (4)

x = 42 - y

x = 42 - 18

x = 24

∴ x = 24, y = 18 and z = 22

Hence, the shortest side of the triangle is 18.

4 0
2 years ago
What does first difference mean?
Sunny_sXe [5.5K]

Answer:

In statistics and econometrics, the first-difference (FD) estimator is an estimator used to address the problem of omitted variables with panel data. It is consistent under the assumptions of the fixed effects model. In certain situations it can be more efficient than the standard fixed effects (or "within") estimator.

First differences are the differences between consecutive y-‐values in tables of values with evenly spaced x-‐values. If the first differences of a relation are constant, the relation is _______________________________ If the first differences of a relation are not constant, the relation is ___________________________

4 0
2 years ago
Read 2 more answers
How do I write this fraction as a decimal 14 3/5
Softa [21]

we have

14 \frac{3}{5}

This is a mixed number

we know that

A mixed number is a combination of a whole number and a fraction.

So

14 \frac{3}{5} is equal to

14 +\frac{3}{5}

where

14 is the whole number

\frac{3}{5} is the fraction

\frac{3}{5}=0.60

14 +\frac{3}{5} =14+0.60\\ \\ =14.60

therefore

the answer is

14.60

3 0
2 years ago
Read 2 more answers
In a triangle, one of the angle measures 70°
Tanya [424]

Answer:

the two angles are 55° each

Step-by-step explanation:

Let the two equal angles be y each

Therefore,

70° + y + y = 180°

Collect like terms

2y = 180 — 70

2y = 110

Divide both side by the coefficient of y i.e 2

y = 110/2

y = 55°

Therefore, the two angles are 55° each

4 0
3 years ago
Other questions:
  • Mrs. Henderson has 60 pens and pencils in her desk. She knows that she has twice as many pencils as pens. She writes the express
    12·1 answer
  • Expression is equivalent to 8(12+30)
    7·1 answer
  • Please answer ASAP!<br><br> The number 650,000 written in scientific notation would be _____.
    10·2 answers
  • What is the square root of 16?​
    6·2 answers
  • A garden hose emits 9 quarts of water in 6 seconds.How long will it take the hose to emit 12 quarts?
    8·2 answers
  • Name the angle found at the corner of this page
    14·1 answer
  • 3(2x - 3) + 4(2 - x) = 0<br> solve for x????
    14·2 answers
  • Can you please help me with these three for my timed test I have rn. And maybe show your work too please!! Thank you :)
    9·1 answer
  • If LM = 22 and MN = 15, find LN.
    5·1 answer
  • A bus entered the freeway and traveled at a constant speed of 80 mph. Two hours later a second bus followed the first bus, enter
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!