When a
relationship between x and y is expressed in a way that it is easy to solve for y and
write y = f(x), we say that y is given as an explicit function of x In the latter case it
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is implicit that y is a function of x and we say that the relationship of the second type,
above, gives function implicitly In this subsection, we learn to differentiate implicit
functions Example 22 Find dy
dx  if x – y = π