Need help with part B pls

At least one of the answers above is NOT correct. Suppose z = x sin(y) , x = 2s2 - 4th, y = 6st. A. Use the chain rule to find as oz and oz as functions of x, y, s and t. Oz = Os 8sx sin (y ) + 6tx- cos(y) Oz = at -16tx sin (y) + 6sx- cos(y) B. Find the numerical values of " and Oz at when (s, t) = (-1, 5). as (-1, 5) = 392 + 144060\\ 3 Oz at ( 1, 0 ) - 784 - 288123