Question 976737
That equation is badly written.


Trying as grouped this way,
{{{(1 - sin^2(A))/(1+cos(A)) =cos(A)}}}


{{{cos^2(A)/(1+cos(A))=cos(A)}}}


{{{((cos^2(A))/(1+cos(A)))((1-cos(A))/(1-cos(A)))}}}


{{{cos^2(A)(1-cos^2(A))/(1-cos^2(A))}}}


{{{cos^2(A)}}}-------Not same as right hand side.


The only other way you could mean is as  {{{1-sin^2(A)/(1+cos(A))=cos(A)}}}.