Problem Solving this equation!

  • Thread starter alexolcz
  • Start date
  • #1
3
0
Hi I was wondering if anybody could help solve this equation. I have the answer but i cant seem to work out how my teacher arrived at this,

Many thanks
Alex

Homework Statement



alpha
A = constant

Homework Equations



Solve for [sin(alpha)]^2

A^2- [sin(alpha)]^2*(A^2+2)+2*[sin(alpha)]^4

The Attempt at a Solution



The solution is given as

[sin(alpha)]^2 = (A^2)/2 or 1
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
25,836
251
Welcome to PF!

Hi Alex! Welcome to PF! :smile:

(try using the X2 tag just above the Reply box :wink:)

So you mean solve A2 - B(A2 + 2) + 2B2 = 0 for B?
 
  • #3
3
0
Hi,

Thanks for your fast reply, sorry about the formatting i'm new to all this!

Yes that the question. I realise that it is basically a simple quadratic but when i try to solve it using to the quadratic formula I don't end up with the required results?

Thanks again

Alex
 
  • #4
berkeman
Mentor
60,544
10,858
Hi,

Thanks for your fast reply, sorry about the formatting i'm new to all this!

Yes that the question. I realise that it is basically a simple quadratic but when i try to solve it using to the quadratic formula I don't end up with the required results?

Thanks again

Alex

Please post your work, so we can see where you are going wrong...
 
  • #5
3
0
Hi,

I've just manage to solve it! Thanks for your offers of help, very kind.

Merry Christmas

Alex
 

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