Question : 161) Evaluate ∂u/∂y at (x, y, z) = (2, 2, : 1757197

161) Evaluate ∂u/∂y at (x, y, z) = (2, 2, 0) for the function u(p, q, r) = epq cos(r); p = 1/x, q = x² ln y, r = z.

A) 4 B) 0 C) 1 D) 8

162) ∂z/∂t for z = f(r, s); r = g(t), s = h(t)

163) ∂w/∂t for w = f(p, q, r); p = g(t), q = h(t), r = k(t)

164) ∂u/∂t for u = f(v); v = h(s, t)

165) ∂w/∂x for w = f(p, q); p = g(x, y), q = h(x, y)

166) ∂w/∂t for w = f(x, y, z); x = g(s, t), y = h(s, t), z = k(s)

167) ∂u/∂r for u = f(x); x = g(p, q, r)

168) ∂u/∂x for u = f(p, q); p = g(x, y, z), q = h(x, y, z)

169) ∂w/∂t for w = f(x, y, z); x = g(r, s, t), y = h(r, s, t), z = k(r, s, t)

170) ∂w/∂t for w = f(x, y, z); x = g(r, s), y = h(t), z = k(r, s, t)