Need a hand on the problems shown in the pic

Problem 1 Find the partial derivatives of function at, 3;, z} = sin(2:3 + y2 + 24) + i at point (1, 11 1}1 3f =v g? 6f _? 3:: "3y "6'2 _' Problem 2 62: Let f (:1:1 3;) = l.+y' Evaluate the value f(.l,.9) using the linear approximation at point (D, U). { Direct calculation of l, 0.9) will be zero point.) Problem 3 Find a limit if it exists or Shaw that there is no limit with a reason. 11m ry{y2 + 23? (midHM] 26\" + y\