3. Use the Chain Rule to find the indicated partial derivatives. (a) w = x² + y² + z², x = st, y = s : st, y = scos(t), z = s sin(t); მო Ow when s = მო მ8 Ət = 4, t = π/3 (b) w = xy+yz + zx, x = r cos(0), y = r sin(0), z = r0; მც aw when r= = 2,0 = π/2 Ər 20 (c) u = xety, x = a²ß, y = ẞ², t = y²α; ди ди au ди მი მØ = au when a = −1, ẞ = 2, y = 1 მე

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