ind the indicated partial derivatives of the function. (a) f(x,y,z) = xy + 2yz +3zx+xª; ƒx‚ ƒy [(b) u(x,t,0) = xe¯t sin 0; ut, up (c) f(x, y) = sin(2x + 3y); fy(-6,4) x [(d) f(x, y, z) = −; f₂(3, 2, 1) Y+z

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