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
Assoli18 [71]
4 years ago
5

Prove that sin54-sin18=1/3

Mathematics
1 answer:
Margarita [4]4 years ago
3 0
Did you mean <span>sin54-sin18=1/2 ?

</span>cos36 - sin18 

= 1-2sin^2 18 - sin18 
<span>
= 1-2[(1/4)(sqrt5 - 1)]^2 - (1/4)(sqrt5 - 1), since sin18 = (1/4)(sqrt5 - 1) </span>
<span>
= 1 - (1/8)(6-2sqrt5) - (1/4)(sqrt5 - 1) </span>
<span>
= 1 - 3/4 + 1/4 </span>
<span>
= 2/4 </span>
<span>
= 1/2 
</span>
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
You might be interested in
A recipie calls for 2 2/4 cups of raisins, but julie only has a 1/4 cup measuring cup. How many 1/4 cups does julie need to meas
scZoUnD [109]

Answer:

10 cups

Step-by-step explanation:

1/4 cup times 4 is 1 cup

1/4 cup times 8 is 2 cups

now you have your two cups and you need two more 1/4 to make 2/4

3 0
3 years ago
Harry worked the following hours in a week. What are the average hours worked for these five days?
Yuki888 [10]
Add all of the hours together than divide by 5 should get 40
4 0
3 years ago
Read 2 more answers
A rectangular-prism-shaped toy chest is 2m by 1m by 1m. A shipping crate is packed with 18 of these toy chests. There is no extr
Alika [10]
2*1*1= 2 m^3 per chest

2 m^3 per chest* 18 chests= 36 m^3 total

Final answer: 36 m^3
7 0
3 years ago
Read 2 more answers
12.252525... is an example of a ___ decimal?
Shalnov [3]
Repeating.................................
6 0
4 years ago
Read 2 more answers
aircraft costs ​$2901 dollars per hour to operate. The algebraic expression 2901t gives the total cost to operate the aircraft f
Cloud [144]

Answer:

$20016.90

Step-by-step explanation:

all you do is multiply. easy-peasy

2901x6.9=20016.90

6 0
3 years ago
Other questions:
  • Need answers please !!!!
    12·1 answer
  • Can someone please help me with this question?
    6·1 answer
  • What are the factors of the quadratic equation? 6=x2 +5x
    8·2 answers
  • ............... help :)????????????????
    9·1 answer
  • Most fish can swim in water (T). Dogs are fish (F). So, Dogs can probably swim. This argument is
    8·1 answer
  • U.S census bureau data shows that the number of families in the United States (in millions) in year x is given by h(x)= 51.42 +
    15·1 answer
  • On a coordinate plane, the x-axis is labeled Turkey hot dogs and the y-axis is labeled dollars. Points (2, 1) and (4, 2) are plo
    12·2 answers
  • 3. If you were to graph the equation y = -x + 1 and graph the equation y
    6·1 answer
  • Hey math can you help
    5·1 answer
  • Solve the following problem.<br> 360 mL =____cups?<br> type your answer...
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!