6) If f(x, y) = 5 siny+3-ecos.x yx² +n cos(2xy), 2 ≤x≤3,5≤y≤7. a) Plot function f. b) Find the local minimum of f and its corresponding values of x and y, where 4x - 3y + 5 =0, x + 2y ≤ 14,3x2 4y - 20. Use xo = 2.6, yo = 6.0.

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