hello

here is a proof that i could not do anything to it

If $\displaystyle A$ and $\displaystyle B$ are two n×n nonsingular matricesm, prove that $\displaystyle B^TA^{-1}$ is nonsingular and $\displaystyle (B^TA^{-1})^{-1}=A(B^{-1})^T$

I want a start