(1 point) Suppose z-z? sin(y) , x-2s2 4t2, y _6st A. Use the chain rule to find ì¿ and ì¿ as functions of x, y, s and t. ìº = (2x.sin(y))(4s) + (x2.cos(y))(-6t) ã¼= (2x*sin(y))(8t) + (x^2"cos(y))(-6s) B. Find the numerical values of ìº and ì¿ when (s, t)-(-3,2) -3, 2) _ 212*-312 + 4*212) * sin(-6*-3*2) * (4-3) + (2-312å£ (-3, 2) 212-312 + 4*212)*sin(-6-32)*(8*2) + (2-312 +-H