Hellow guys, Welcome to my website, and you are watching Multivariable Calculus Derivative of r(t) = sqrt(t)*i + (1 - t^3)*j + sec(3t)*k. and this vIdeo is uploaded by The Math Sorcerer at 2014-12-19T13:31:04-08:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.