Hello guys need them please please could write them down. I'mUnable to download

Question 15 Use Lagrange multipleRs to minimize the function fic,y, 2 ) = x2 + 42 + 2' Subject to the following constraint x+ 4 +2 - 24 20 Assume that z, y, 2 are positive Question 74 FOR thy) = 2 Ryty?_ Hxty find all The usvalues of x and y such fifty )= 0 and fy fry) = simultaneously Question 18 Let w= cos( 5x -64) where cett y = 8 Find dow