Solve Optimization Problems | Derivative of T(y) | Maximal/Minimal Area"

[shadowman187]

Homework Statement

look at jpg attachment

Homework Equations

T(y)=(z-y/r)+(sqrt(x^2+y^2)/s)
ac=z
bc=x
dc=y
ab=w
im having trouble taking the derivative of T(y) and how to solve it

on the second one i think there is no maximal area but there is a minimal but not sure how to start it

 

[shadowman187]

nevermind i figured them out