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
        If sinx + sin^2 x = 1 then value of cos^12 x + 3 cos^10 x + 3 cos^8 x + cos^6 x + 2 cos^4 x + cos^2 x - 2 is equal to
10 months ago

Answers : (1)

Shashank Singh
askIITians Faculty
57 Points
							sinx= 1-sin^2 x= cos^2 x
=sin^6 x +3 sin^5 x + 3sin^4 x + sin^3 x + 2 sin^2 x + sinx – 2
=sin^4x( sin^2 x+ sinx) + 2sin^3 x (sin^2 x+ sinx) + sin^2 x( sin^2x + sinx)+ 2(sin^2 x + sinx) -sinx -2
as we know that sin^2 x+ sinx= 1
=sin^4x + sin^3x + sin^3 x + sin^2 x +2 – sinx- 2
=sin^2 x(sin^2 x+ sinx) + sinx(sin^2x+ sinx) -sinx
=sin^2 x+ sinx-sinx
=sin^2 x [ans]
10 months 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