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gulaghasi [49]
3 years ago
10

Attached is a screenshot of another problem I am having issues with. please please please help me

Mathematics
1 answer:
anyanavicka [17]3 years ago
4 0
\bf cos(\alpha+\beta)cos(\alpha-\beta)\\\\
-----------------------------\\\\
\textit{using the sum identities}\\\\\

\begin{array}{ccccccll}
[cos(\alpha)cos(\beta)&-&sin(\alpha)sin(\beta)]&[cos(\alpha)cos(\beta)&+&sin(\alpha)sin(\beta)]\\
a&-&b&a&+&b
\end{array}\\\\
\textit{notice above, is just a difference of squares, thus}
\\\\\\\
[cos(\alpha)cos(\beta)]^2-[sin(\alpha)sin(\beta)]^2\\\\
\textit{now let us distribute the exponents}\\\\

\bf cos^2(\alpha)cos^2(\beta)-sin^2(\alpha)sin^2(\beta)\\\\
-----------------------------\\\\
\textit{now, let us use the pythagorean identity of }\\\\
sin^2(\theta)+cos^2(\theta)=1\implies cos^2(\theta)=1-sin^2(\theta)\\\\
-----------------------------\\\\\
[ 1-sin^2(\alpha)][ 1-sin^2(\beta)]-sin^2(\alpha)sin^2(\beta)
\\\\\\\
1-sin^2(\beta)-sin^2(\alpha)\underline{+sin^2(\alpha)sin^2(\beta)-sin^2(\alpha)sin^2(\beta)}
\\\\\\
\underline{1-sin^2(\beta)}-sin^2(\alpha)\implies cos^2(\beta)-sin^2(\alpha)
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Please answer. I think its B because negative × negative = positive. So -5 × -5 = 25. BUT...since the exponent is negative, mayb
yanalaym [24]
Evaluate a^2 where a = -5:
a^2 = (-5)^2
Hint: | Evaluate (-5)^2.
(-5)^2 = 25:
Answer:  25


7 0
3 years ago
What does interval mean
creativ13 [48]

Answer:

an intervening time

Step-by-step explanation:

8 0
2 years ago
A construction crew is lengthening a road. The road started with a length of 51 miles, and the crew is adding 2 miles to the roa
nikitadnepr [17]

Answer:

Total length after 33 days will be 117 miles

Step-by-step explanation:

A construction crew is lengthening a road. The road started with a length of 51 miles.

Average addition of the road is = 2 miles per day

Let the number of days crew has worked are D and length of the road is L, then length of the road can represented by the equation

L = 2D + 51

If the number of days worked by the crew is = 33 days

Then total length of the road will be L = 2×33 + 51

L = 66 + 51

L = 117 miles

Total length of the road after 33 days of the construction will be 117 miles.

5 0
2 years ago
What is the best approximation for the perimeter of polygon ABCDE? A. 11.0 units B. 17.0 units C. 24.3 units D. 22.1 units
erastovalidia [21]

TheThe best approximation for the perimeter of polygon ABCDE is: C. 24.3 units.

<h3>Perimeter of polygon</h3>

Coordinate:

A=(-2,3)

B=(0,6)

C=(5,4)

D=(4,-1)

E=(-1,-2)

Distance AB=√(0+2)²+(6-3)²

Distance AB=√4+9

Distance AB=√13

Distance BC=√(5-0)²+(4-6)²

Distance BC=√25+4

Distance BC=√29

Distance CD=√(4-5)²+(-1-4)²

Distance CD=√1+25

Distance CD=√26

Distance DE=√(-1-4)²+(-2+1)²

Distance DE=√25+1

Distance DE=√26

Distance EA=√(-2+1)²+(3+2)²

Distance EA=√1+25

Distance EA=√26

Perimeter of pathogen ABCDE

=AB+BC+CD+DE+EA

=√13+√29+√26+√26+√26

=√13+√29+3√26

=24.2877 units
= 24.3 units (Approximately)

Therefore the correct option is C.

Learn more about Perimeter of polygon here:brainly.com/question/3310006

#SPJ1

7 0
1 year ago
Read 2 more answers
A high school basketball player attempted 35 free throws in a season. An analyst determined that the player successfully made 4
Iteru [2.4K]
36 divided by 6
that equals 6
multiply 6 x 5
that equals 30

your final answer is: 30

*HOPE I HELPED!*
8 0
3 years ago
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