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
soldi70 [24.7K]
3 years ago
12

Explain how to find the exact value of cos(75°).

Mathematics
1 answer:
DanielleElmas [232]3 years ago
4 0

Answer:

\cos(75 \degree)  =  \cos(45 \degree + 30\degree)  \\  \\  =  \cos(45\degree)  \cos(30\degree)  -  \sin(45\degree)  \sin(30\degree)  \\  \\  = ( \frac{1}{ \sqrt{2} } ).( \frac{ \sqrt{3} }{2} ) - ( \frac{1}{ \sqrt{2} } ).( \frac{1}{2} ) \\  \\  =  \frac{ \sqrt{3} }{2 \sqrt{2} }  -  \frac{1}{2 \sqrt{2} }  \\  \\  =  \frac{ \sqrt{3}  - 1}{2 \sqrt{2} }  \\  \\   =  \frac{0.73205}{2.828427}  \\  \\  = 0.2588

You might be interested in
Jing has $800 to deposit into two different savings account. She will deposit $600 into an account that earns simple interest an
ivolga24 [154]

Answer:

the question answer is A

Step-by-step explanation:

7 0
3 years ago
Equivalent factored form for 10x^2+15x-9=2x^2+x-14
yanalaym [24]
Factored form - x= -1/2, -5/4
3 0
3 years ago
What is 2 4/7 of 10 1/9
Fudgin [204]

Answer:

26

is the answer to the question

4 0
3 years ago
14k²+49k+21 factorise<br>​
irina [24]

Answer:

(2k+1)(k+3)

Step-by-step explanation:

14k²+49k+21

simplify by dividing the whole equation by 7

2k²+7k+3

factorise

(2k+1)(k+3)

6 0
3 years ago
What is the math sentence for 3.46 and 0.346
Gnesinka [82]

Answer:

3.46 in a fraction

340.60

Step-by-step explanation:

The decimal 0.346 equals 34.6%

To convert from decimal to percent, just multiply the decimal value by 100. In this example we have: 0.346 × 100 = 34.6% (answer).

➥ The ease way:

1) Move the decimal point two places to the right: 0.346 → 3.46 → 34.6.

2) Add a % sign: 34.6%

Answer: 34.6%

4 0
3 years ago
Read 2 more answers
Other questions:
  • Let g(x)=-5x+2 with g(-1)
    15·1 answer
  • Was i right on the first 2? Please correct them if i'm wrong
    8·1 answer
  • What is the product of 5×10'5​
    10·1 answer
  • Noriko and her friends make 26 pints of lemonade to sell at the fundraiser. which operation will noriko use to find how many cup
    5·1 answer
  • a women has three skirts, five shirts and four hats from which to pick an outfit.how many different outfits can she wear if she
    12·2 answers
  • According to a recent study, 1 in every 9 women has been a victim of domestic abuse at some point 19) in her life. Suppose we ha
    7·1 answer
  • PLZ HELP ASAP!!! I WILL NAME BRAINLIEST!! 65 POINTS!! (:
    14·1 answer
  • 12/4 = 12 1/4 True or False
    13·1 answer
  • Find the number that makes the ratio equivalent to 1:8.
    13·2 answers
  • Need math help please
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!