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:


sin2(n + 1)A - sin2nA = sin(2n + 1)A.sinA

8 years ago

Answers : (2)

vikas askiitian expert
509 Points
							

sin2(n+1)A - sin2nA = sin(2n+1)A.sinA

we have formula sin2a - sin2b =sin(a-b)sin(a+b)

therefore

                 sin2(n+1)A - sin2nA=sin[(n+1)A+nA].sin[(n+1)A-nA]

                                            =sin(2n+1)A.sinA =RHS

hence proved

8 years ago
madhu voleti
44 Points
							

sin^2(n + 1)A - sin^2nA = sin(2n + 1)A.sinA
Solution:-
    L.H.S:-sin^2(n + 1)A - sin^2nA =
        Sin[(n+1)A+nA].Sin[(n+1)A-nA]        ["a^2-b^2=(a+b)(a-b)"]
        =Sin[nA+A+nA].Sin[nA+A-nA]
        =Sin[A(n+1+n)].SinA
        =Sin(2n+1)A.SinA=R.H.S

 

Thank You!!!!!!!!!!!!!!!!

Wish You Happy learning of trignometry..............

8 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Get Extra Rs. 1,590 off

COUPON CODE: SELF10


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


Get Extra Rs. 64 off

COUPON CODE: SELF10

Ask Experts

Have any Question? Ask Experts

Post Question

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