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3 years ago

Using ratio pleases help i´m stuck i need #5 for one side 1-5 for the other

Mathematics

1 answer:

Fudgin [204]3 years ago

5 0

How did you put multiple pictures on this app? i can’t figure how to

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5cosx -2sin(x/2) +7=0<br>Help me to find x step by step<br>pls

miskamm [114]

Answer:

x = 180

Step-by-step explanation:

First, you need to know

1. Double-angle formula:

cos(2x) = $cos^{2}x - sin^{2}x$

2. Pythagorean identity:

$cos^{2}x + sin^{2}x = 1$

Back to your problem, replacing the variable by the above:

$5cosx-sin\frac{x}{2}+7 = 0$

$5(cos^{2}\frac{x}{2}-sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0$ By Double-angle formula

$5(1 - 2sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0$ By Pythagorean identity

Given $y = \frac{x}{2}$

$5(1-2sin^{2}y) - 2siny + 7 = 0$

$10sin^{2}y+2siny-12=0$

$5sin^{2}y+siny-6=0$

$(5siny + 6)(siny - 1)=0$ , we know -1 < sinx < 1, for every x ∈ R

$siny = 1, y =90$

$y = \frac{x}{2}$

$x = 180$

8 0

3 years ago

What is the domain associated with?

artcher [175]

Answer:

A domain name (often simply called a domain) is an easy-to-remember name that's associated with a physical IP address on the Internet. It's the unique name that appears after the at sign in email addresses, and after 3 w's in web addresses.

Step-by-step explanation:

i hope this helps :) if not sorryyy

4 0

3 years ago

Which Lines Are Parallel if M<4 = m<5? Justify Your Answer.

vazorg [7]

Y is parallel to S because angle 4 and angle 5 are alternate interior angles.
Hope that helps.

6 0

3 years ago

Which of the following is the main of the set of data below? 30, 29, 28, 30, 24, 12, 26, 33, 25, 23

Marianna [84]

Answer:

The mean of the data is 26.

Step-by-step explanation:

Consider the provided data:

30, 29, 28, 30, 24, 12, 26, 33, 25, 23

Mean can be calculated as:

The average of all the data in a set.

$x=\frac{\Sigma x_{i}}{n}$

Therefore,

$x=\frac{30+29+28+30+24+12+26+33+25+23}{10}$

$x=\frac{260}{10}$

$x=26$

Thus, the mean of the data is 26.

3 0

3 years ago

A bag contains three red marbles, four blue, nine yellow, and five green. what is the probability of getting a yellow or green

Marina86 [1]

Answer:

14/21 or 2/3

Step-by-step explanation:

66 percent

6 0

2 years ago

Read 2 more answers