Using the definition of derivative how do i solve this equation: f(x)=5/square root 3x. Please help....? Ive used the fast short cuts to find this derivative but I cant seem to get how to do it by the definition way and i have a test over definition tomorrow. Please help me. im desperate. My answer that i got not using defintion of -5/2x sqroot3x. My tutor couldnt even figure this one out.