How Do You Square Cosine B?

[chemic_23]

Homework Statement

Homework Equations

how do you square cosB?

The Attempt at a Solution

 

[Galadirith]

Hi chemic_23, well you haven't really asked a question. In answer to you how do you square $cos\beta$ (i assume that's what you meant) you can square it like any other number as $\textbf{cos\beta}$ will be a real number if beta is a real number. Is you question find the solutions to this equation, because there are an infinite number of them?

If you could clarify you question then I am sure you'll find the help you need :D

 

[chemic_23]

I'm trying to understand this part of solution

but I don't have any idea on how to square the cosB... It just came out with no detailed solution... please help

 

[salman213]

if you have f(l) = (x + y) / z where x,y,z are constants

remember you can always change that to

x /z + y/z

and then what would be f^2 (l)

(x /z + y/z)^2 = (x /z + y/z)(x /z + y/z)

and you can expand that right?

 

[chemic_23]

thanks:)