ln Problems 43-48, suppose that the indicated "solutions" were given to you by a student whom you are tutoring.
(A) How would you have the student check each solution?
(B) Is the solution right or wrong? If the solution is wrong, explain what is wrong and how it can be corrected.
(C) Show a correct solution for each incorrect solution, and check the result by differentiation.
a.


b.


c.