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.
Close

MY CART (5)

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

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

⇐ BackProceed to Checkout ⇒
There are no items in this cart.
Continue Shopping
Menu
Grade: 

                        
solve the equation Cosa+sin2a+cos3a=0
6 years ago

Answers : (2)

Rinkoo Gupta
askIITians Faculty
80 Points 
							(cosa+cos3a)+sin2a=0
2cos2a.cosa+2sinacosa=0
2cosa(cos2a+sina)=0
=> cosa=0 or cos2a+sina=0
=>a=pi/2 or 1-2sin^2a+sina=0
2sin^2a-sina-1=0
sina={1+-sqrt(1-4(2)(-1))}/2(2)
=>sina=1,-1/2
=>a=pi/2 and 7pi/6
hence a=pi/2,7pi/6
Thanks & regards
Rinkoo Gupta
AskIITians Faculty
6 years ago
Arun Kumar
IIT Delhi
askIITians Faculty
256 Points 
							
221-1934_WP_20140514_004.jpg
6 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Other Related Questions on Discuss with colleagues and IITians

i got 95 percentile this year should i take long term pls give me a suggestion Answer & Earn Cool Goodies
How to prepare for kvpy sb stream with in 90days? Sir please help me .. Answer & Earn Cool Goodies
Which of the following is an economic good? A Sunshine B Air C Rainfall D A bottle of water
You can enroll for askiitians JEE/NEET foundation live online classes up to 10 th so that she will...
Given that Pvector+Q vector =R vector and that R vector is perpendicular to P vector .If P=R then...
View all Questions »


Course Features

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


Course Features

  • 731 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