#sqrt(5/(32y^10)#
#:.=sqrt(5)/sqrt(32y^10)#
#:.=sqrt(5)/sqrt(2*2*2*2*2y^10)#
#sqrt2*sqrt2=2#
#:.=sqrt 5/(4 sqrt (2 y^10))#
#:.=sqrt 5/(4 sqrt (2 y^10))xx(4 sqrt (2 y^10))/(4 sqrt (2 y^10))#
#sqrt (2 y^10)*sqrt (2 y^10)=2y^10#
#:.=(cancel4^1sqrt (10y^10))/(cancel16^4xx2y^10)#
#:.=(sqrt (10y^10))/(8y^10)#