Manipulate this Expression?

Posted on 2017-03-09 18:17:00 in Essay Writing and Letter Writing by TELLY

I've been told the following expression can be manipulated into a product of squared terms. 

(16*K/R)*cosh(y/2) + 2*(K^2)*cosh(y) - (16*K/R) - 2*(K^2) 

(16*K/R)*[cosh(y/2) - 1] + 2*(K^2)*[cosh(y) - 1] 

In order to do this, I've been told there should be an intermediate step, 

(A/B + 1)*B 

where B is a product of squared terms, and the expression inside the parentheses can itself be manipulated into a squared term. 

Tried using some double/half angle substitutions, the exponential forms of sinh and cosh, etc. Nothing has clicked yet. 

Does anyone else see how this can be done? Thanks.

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