the speed of dc motor is given by N=60(A/p)(V-Ia*Ra)/(Z*phi)
A=no. of parellel paths
P=no of poles
V=voltage applied at dc motor
Ia= armature current
Z= total no. of armature conductor
phi=flux per conductor.
but if some how we stop...
lim(x,y)->(4,pi)(x^2sin(x/y)), i tried it by polar as well as epsilon delta method, but by polar coordinate method it is coming that " limit doesn't exits" but by epsilon delta method "it exists & is equal to (epsilon+(16/(2)^(1/2)) )^(1/2)-4.