Find the differential of each function. (a) y = etan(at) dy = e (b) y = √√√2 + In(z) dy = tan (t) sec² ( t) * 2e²z√√2+ln(z) -√√(√In(z) + 2 e ") + X Use a linear approximation (or differentials) to estimate the given number. (Round your answer to five decimal places.) √28 3.03659 x