ok, I am completely at a loss - I don't even know where to begin.
for (a): I should find the slope of T - but I have no idea how - could I make a triangle and solve for the hyp? so would it be like
and then I am at a complete loss, partially because the given diagram is so confusing ... any help would be greatly welcomed
For part d, this is simply . It doesn't help you a whole lot except that as h approaches zero, this is the derivation of the derivative of at a.