UrbanPro
Login Ask & Answer Success Stories Paid Courses Free Classes Tuition & Classes Fees Write a Review All Categories Help Center
Post your Learning Need Signup as a Tutor
✕

Popular Cities

Bangalore

Hyderabad

Delhi

Mumbai

Chennai

Pune

Kolkata

Gurgaon

Ahmedabad

Jaipur

Noida

✕

Take Class 10 Tuition from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Book a Free Demo

Class 10 > Learn Class IX-X Tuition > find value of Sin 18
✕

Search in

find value of Sin 18

Asked by Last Modified  

4 Answers

Learn Class IX-X Tuition

Follow 0
Answer

Please enter your answer

Math Magician

/4=0.3090
Comments
Dislike Bookmark

The value of Sin 18 0.309016
Comments
Dislike Bookmark

Tutor

sin 72° = 2 sin 36° cos 36° by the double angle relationship. sin 72° = 4 sin 18° cos 18° (1 - 2sin2 18°) by the double angle relationship, again. cos 18° = 4 sin 18° cos 18° (1 - 2sin2 18°) by the cofunction properties: sin 72° = cos 18°. ...
read more
sin 72° = 2 sin 36° cos 36° by the double angle relationship. sin 72° = 4 sin 18° cos 18° (1 - 2sin2 18°) by the double angle relationship, again. cos 18° = 4 sin 18° cos 18° (1 - 2sin2 18°) by the cofunction properties: sin 72° = cos 18°. 1=4 sin 18° (1 - 2sin2 18°) Let x=sin 18°, this is known as 1=4x(1-2x2) substitution, a useful technique in calculus. 8x3-4x+1 = 0 A product is zero only when one of its factors is zero. 8x3-4x+1 = (2x-1)(4x2+2x-1)=0 (2x-1)=0 implies x=½=sin 30° > sin 18° ; Since we know sin is increasing on [0°,90°]. x=(-2 ± [square root of] (4 + 4•4•1))/8 So we must solve the other factor, = (-2 ± [square root of] 20)/8 using the quadratic formula. = (-2 ± [square root of] 4[square root of] 5)/8 = (-1 ± [square root of] 5)/4 But the sin 18° > 0, so it cannot be negative. sin 18° = ([square root of] (5)-1)/4 Hence the middle root is the one we want. read less
Comments
Dislike Bookmark

Experienced Tutor in schooling subject

sin ? = ?1±root5/4
Comments
Dislike Bookmark

View 2 more Answers

Related Questions

समरूपः शरीरसन्निवेशः what is the meaning of this line 
समरूपः शरीरसन्निवेशः। शरीरे सन्निवेशः (प्रवेशः) शरीरसन्निवेशः। Entrance into/ presence in the body is शरीरसन्निवेशः। समरूप means equally or uniformly present. It means that the presence in the body is...
Rahul
How to start online tution? Equipments required like whiteboard with googlehandout and Skype. Is the whiteboard electronic or simple.what is it cost. I m not getting electronic or digital whiteboard. Can anyone suggest me from where can I get it in Ranchi ASAnsol or kolkatta plz help me or give me remedy for it and plz also quote the price of electronic board.
It will be prepared by a carpenter under your observation. U need a sheet of Glass the size you need boards size, white plastic sheet same size, ply board for frame and electric bulbs.
Abhishek
How many types of unemployment are there?
cant define
Mukul
0 0
6
Define force?
strength or energy as an attribute of physical action or movement.
Anurag
what is homologous series?
A homologous series is a series of carbon compounds that have different numbers of carbon atoms but contain the same functional group. For example, methane, ethane, propane, butane, etc. are all part of...
Dr. Anshu

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

Fmily vocabulary

Kalpana M.

0 0
0
* Solving Science numericals or math question
While solving Science numericals or math question always follow below steps. * Write all the parameteres given in question with unit * Think what to be find or calculated * Think how to proceed * Write...

Arvind Srivastava

0 0
0
Tips to keep in mind while studying
Here are few study tips: 1. Find out a suitable place for studying. Your bedroom or classroom may not be the best place to study. Find a peaceful place. 2. Collect revision materials before you begin...

Shreeharsh Patil

0 0
0
Increase efficiency of brain
This mind game shall increase efficiency of your brain. eg. if you study 6 hours you can produce an output of 12 hours by playing this game. If you really wanna play this game and increase your abilty...

Rishabh Pandey

0 0
0
Adjective
An adjective is a word which is used to qualify a noun or a pronoun. Eg. Big building, tall man, fat boy, etc. Kinds of adjective: 1. Adjective of quality: Eg: Good, wise, tall, beautiful, intelligent,...

Anand B

0 0
0

Recommended Articles

Meet Sandhya R, a B.Sc tutor from Bangalore

Sandhya is a proactive educationalist. She conducts classes for CBSE, PUC, ICSE, I.B. and IGCSE. Having a 6-year experience in teaching, she connects with her students and provides tutoring as per their understanding. She mentors her students personally and strives them to achieve their goals with ease. Being an enthusiastic...

Read full article >

Meet Raghunandan.G.H, a B. Tech Tutor from...

Raghunandan is a passionate teacher with a decade of teaching experience. Being a skilled trainer with extensive knowledge, he provides high-quality BTech, Class 10 and Class 12 tuition classes. His methods of teaching with real-time examples makes difficult topics simple to understand. He explains every concept in-detail...

Read full article >

Meet Swati, a Hindi Tutor from Bangalore

Swati is a renowned Hindi tutor with 7 years of experience in teaching. She conducts classes for various students ranging from class 6- class 12 and also BA students. Having pursued her education at Madras University where she did her Masters in Hindi, Swati knows her way around students. She believes that each student...

Read full article >

Meet Mohammad Wazid, a skilled trainer for...

Mohammad Wazid is a certified professional tutor for class 11 students. He has 6 years of teaching experience which he couples with an energetic attitude and a vision of making any subject easy for the students. Over the years he has developed skills with a capability of understanding the requirements of the students. This...

Read full article >

Find Class 10 Tuition near you
Class 10 Tuition in Delhi
Class 10 Tuition in Bangalore
Class 10 Tuition in Hyderabad
Class 10 Tuition in Kolkata
Class 10 Tuition in Mumbai
Class 10 Tuition in Chennai
Class 10 Tuition in Pune
Class 10 Tuition in Noida
Class 10 Tuition in Lucknow
Class 10 Tuition in Jaipur

Looking for Class 10 Tuition ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you
X

Looking for Class 10 Tuition Classes?

The best tutors for Class 10 Tuition Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Take Class 10 Tuition with the Best Tutors

The best Tutors for Class 10 Tuition Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more

ThinkVidya Learning Pvt Ltd © 2010-2024All Rights Reserved