questions below:

Find the requested partial derivative. oz if z = z+ xy - 1 and y =x+ y -1 ay O A. x + 3y's - y 2 - 1 3z OB. x + 3y's - y 3z 2 + 1 O C. x - 3y - y 3Z 2 + 1 O D. x - 3y's - y 3z 2 . -1If w= x2 - 2y + 2z + cost and x - y = t, find the partial derivatives below. ow ow b. c. a dy ay oz X, y X, Z z, t aw aw d. e. f. at at oz y , Z y, t X, Z Ow a, dy x , Z ow b dy z, t ow C. E az X, y ow d oz y, t aw at X , Z ow E at y, zow Find and ay ay at the point (w, x, y, z) = ( - 4,1, - 1,1) if w= 4x y2 + 4yz -423 and x2 + y2 + z2 = 3. X Z . . . ow ay X (Simplify your answer.) ow (Simplify your answer.)