You said that you just did a whole page of ??? What does the hyperbolic tangent have to do with this?

This is the expression:

All you need to do is use implicit differentiation, and solve for .

It's easy to show that:

.

Use this to find the derivative of the left side:

where . You should be able to figure that out using implicit differentiation.

Use a similar argument to differentiate the implicit logarithmic function.