A metallic disc is being heated. Its area A(in `m^2`) at any time t(in second) is given by
Channel: Doubtnut
Date: 26/07/2020

A metallic disc is being heated. Its area A(in `m^2`) at any time t(in second) is given by `A=5t^2+4t+8`. Calculate the rate of increase in area at `t=3s`.