3 years ago

Find an exact value cos 75°

Mathematics

2 answers:

Drupady [299]3 years ago

5 0

Answer:

0.2588

Step-by-step explanation:

Vikentia [17]3 years ago

4 0

Answer:

(√3 - 1) / 2√2.

Step-by-step explanation:

Using the compound angle identity

cos(A + B) = cosA cosB - sinA sinB:-

cos 75

= cos (45 + 30)

= cos 45 cos 30 - sin 45 sin 30

= 1 / √2 * √3/2 - 1 / √2 * 1 / 2

= √3 / 2√2 - 1 / 2√2

= (√3 - 1) / 2√2.

You might be interested in

What is the answer to this???

alexandr1967 [171]

Answer:

A b and c

Step-by-step explanation:

D might be true but i am not sure

8 0

3 years ago

Read 2 more answers

Is 2 a factor of 84 explain your thinking and use division to ansnwer

irina1246 [14]

Yes because 8 and 4 is an even number

4 0

3 years ago

Read 2 more answers

At prom, Dina asks a boy to dance. A moment later, her friend decides to ask a boy to dance, too.

leonid [27]

Answer:

Dina's friend is jealous of Dina's confidence so she wanted to "what up" her :)

Step-by-step explanation:

3 0

3 years ago

Alyn drives 20.4 miles in 17 minutes.

Galina-37 [17]

Answer:

12 mph

Step-by-step explanation:

Speed = distance/time

Distance = 20.4 miles
Time = 17 minutes = 17*1/60 hours = 17/60 hours

Speed is:

20.4 : 17/60 =
20.4*60/17 =
72 mph

Alyn exceeded the limit by:

72 - 60 = 12 mph

5 0

3 years ago

Please help will mark the brainliest

trasher [3.6K]

Answer:

She has $10 left.

Step-by-step explanation:

There are 13 tags. Every tag is 5$.

13 tags times 5 dollars equals 65 dollars spent.

75 dollars minus 65 dollars spent = 10 dollars left.

Ruby has 10 dollars left.

3 0

3 years ago