Using total differentials, find the approximate change of the given function when x changes from 1to1.25 and y changes from 2 to 1.65. If necessary, round your answer to four decimal places.

f(x,y)=4x^2+5y^23xy+11

Using total differentials, find the approximate change of the given function when x changes from 0to0.26 and y changes from 0to 0.16. If necessary, round your answer to four decimal places.

f(x,y)=2e^(5x+3y)