This seems like it should be easy but its got me beat:
$c = {a \over {a + b} }$
What is:
$\partial c \over \partial a$
?
This seems like it should be easy but its got me beat:
$c = {a \over {a + b} }$
What is:
$\partial c \over \partial a$
?
$a/(a+b)= 1- b/(a+b)$ Thus the derivative is $b(a+b)^-2$