The combined resistance R of two resistors `R_(1) and R_(2) " where " R_(1), R_(2) gt 0` is given by `(1)/(R) = (1)/(R_(1)) + (1)/(R_(2))`
If `R_(1) + R_(2) = C` (constant), show that the maximum reistance R is obtained by chossing `R_(1) = R_(2)`