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2 years ago

10

I need help I’m not good at math

1 answer:

kiruha [24]2 years ago

5 0

D is a mono nominal ;)

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Sin5A/SinA-cos5A/cosA=4cos2A

irina1246 [14]

Answer:

See Explanation

Step-by-step explanation:

$\frac{ \sin5A}{\sin A} - \frac{ \cos5A}{\cos A} = 4\cos2A \\ \\ LHS = \frac{ \sin5A}{\sin A} - \frac{ \cos5A}{\cos A} \\ \\ = \frac{ \sin5A \:\cos A - \cos5A \: \sin A}{\sin A \:\cos A } \\ \\ = \frac{ \sin(5A -A )}{\sin A \:\cos A} \\ \\ = \frac{ \sin 4A}{\sin A \:\cos A} \\ \\ = \frac{ 2\sin 2A \: \cos 2A}{\sin A \:\cos A} \\ \\ = \frac{ 2 \times 2\sin A \: \cos A \: \cos 2A}{\sin A \:\cos A} \\ \\ = \frac{ 4\sin A \: \cos A \: \cos 2A}{\sin A \:\cos A} \\ \\ =4\cos 2A \\ \\ = RHS \\ \\ thus \\ \\ \frac{ \sin5A}{\sin A} - \frac{ \cos5A}{\cos A} = 4\cos2A \\ \\ hence \: proved$

5 0

3 years ago

Which expression is equivalent to 7/32 + 2/32

Marta_Voda [28]

Answer:

36 square root 2 also known as C

Step-by-step explanation:

8 0

2 years ago

Read 2 more answers

X =<br> 95<br> (7x - 4)<br> (3x + 23)°<br> (9x – 6)

anygoal [31]

Answer:

661 is for the first 308 for second 849 for last

Step-by-step explanation:

3 0

2 years ago

In a group of 60 students, 12 students take algebra one, 18 students take algebra 2 and 8 students take both subjects how many s

hoa [83]

60-12-18-2-8=20
=48-18-2-8
=30-2-8
=28-8
=20

So, 20 students don't take either of these subjects.

5 0

2 years ago

Using all or some of the digits 2, 3, 4 and 5, Edward writes

Vesnalui [34]

Using the arrangements formula, considering the given digits, it is found that Edward writes 6 numbers.

<h3>What is the arrangements formula?</h3>

The number of possible arrangements of n elements is given by the factorial of n, that is:

$A_n = n!$

In this problem, the first digit has to be 5, while the other three are arranged, hence the total number of arrangements is given by:

$A_3 = 3! = 6$

More can be learned about the arrangements formula at brainly.com/question/25925367

#SPJ1

5 0

1 year ago