(' bracket surrounding some parts of equation is also separated, i.e.
\left(is in the upper line and
\right)is in the lower line. In that case
\left(resizes according to its contents but
\right)doesn't resize and it is not even displayed. I am using AmsMath package and I know that it is better to use
\Biggcommands, however even the largest
\Biggis much smaller than my equation's contents.
\left(displays big enough but
\right)is not even displayed