badge image

Enroll For Free Now & Improve Your Performance.

×
User Icon
User Icon
User Icon
User Icon
User Icon

Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 11

                        

prove that sin^2 24 - sin^2 6= (5^1/2 - 1 )/8

10 years ago

Answers : (4)

vikas askiitian expert
509 Points
							

sin224 - sin26 = (51/2-1)/8

we have to prove this

sin2A - sin2B = sin(A-B)sin(A+B)

taking LHS

sin224 - sin26= sin18sin30=(sin18)/2

sin18 = (51/2-1)/4

so LHS becomes

          = (51/2-1)/8 =RHS

hence proved

10 years ago
SAGAR SINGH - IIT DELHI
879 Points
							

Dear student,

We know that


sin(A + B)sin(A - B) = sin^(2)A - sin^2(2)B

A=24

B=6

Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.

All the best.

Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.

Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..

 

Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

10 years ago
jagdish singh singh
173 Points
							

1610_24699_gif.latex (46).gif

10 years ago
Rishi Sharma
askIITians Faculty
614 Points
							Dear Student,
Please find below the solution to your problem.

sin224 - sin26 = (51/2-1)/8
we have to prove this
sin2A - sin2B = sin(A-B)sin(A+B)
taking LHS
sin224 - sin26= sin18sin30=(sin18)/2
sin18 = (51/2-1)/4
so LHS becomes
= (51/2-1)/8 =RHS
hence proved

Thanks and Regards
3 months ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies


Course Features

  • 731 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 31 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details