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Partial derivatives Find the first partial derivatives of the function f(x, y) = y sin(yx) of = Ox of = ayNormal vector to a surface Find tangent vectors to the surface z = 2 ya + 2 ya at the point (1, 1, 4) in the form: V1 = (1, 0, V2 = (0, 1, Hence find a normal vector to the surface at the given point: n = V1 X V2 =(