(Solved):
Find the total derivative \( d f / d y \), given: (a) \( f(x, y)=(x+y)(x-2 y) \), where \( x=2-7 y ...
Find the total derivative \( d f / d y \), given: (a) \( f(x, y)=(x+y)(x-2 y) \), where \( x=2-7 y \) (b) \( f(x, y)=4 x^{2}-3 x y+2 y^{2} \), where \( x=y^{-1} \)