Question 242931
{{{a = 1/sqrt(1-B^2)}}}

I personally would rewrite in terms of powers:

{{{a = (1-B^2)^(-1/2)}}} 1/2 means the square root (1-B^2) and the negative sign means to take the reciprocal of this result ie one divided by the result.

{{{a^-2 = 1-B^2}}} raise both sides to the exponent -2. Remember that when you raise a power to a power you multiply them together so -1/2 * -2 = 1

{{{1-a^(-2) = B^2}}}  take one from both sides and multiply by -1

{{{(1-a^(-2))^(1/2) = B}}}   raise both sides to the power of 1/2