Tan^5 x = (sec^4 x - 2sec ^2 x +1 ) tan x

20y5 times 2 is 1010 times -2 is -20, plus y

Skew lines(segments) are lines(segments) in 3 dimensions that do not intersect the given segment and are not parallel to it.  ae, bf, eg, and fh are your skew segments.  i hope that : )