18. (a) Use the Hermit interpolating method to construct an approximate polynomial for the following data. 1 0.86199480 0.15536240 0.5 0.95802009 0.23269654 .0 1.0986123 0.33333333 1.0 1.2943767 0.45186776 (b) Use the polynomial constructed in (a) and the given value of to approximate f(r) and calculate the absolute error f(z) In(ex +2); f(0.25)