"The Reqd. Lim.="lim_(x to 0)(1-cosmx)/(xsinx),
=lim_(x to 0){2sin^2((mx)/2)}/(xsinx),
=lim2{sin((mx)/2)/((mx)/2)*((mx)/2)}^2-:{x((sinx)/x*x)},
=lim2{sin((mx)/2)/((mx)/2)}^2*(m^2x^2)/4-:{x^2(sinx/x)},
=(2*m^2/4)*lim_((mx)/2 to 0){sin((mx)/2)/((mx)/2)}^2-:lim_(x to 0){(sinx/x)},
=m^2/2*(1)^2-:1.
rArr "The Reqd. Lim.="m^2/2.