1.(2.2) Find the limit. (1) lim 5x x-0 sin 4x (2) lim 2x3+3y4 (x,y)(0,0) x2 + y² 2.(2.3) Let f(x, y) = xy(ex + e) for (x, y) = R². (1) Find fx and fy. (2) Find an equation of the tangent plane to the graph of ƒ at (1, 1, 2e). 3.(2.4) (1) Let c(t) = (sect, tant), πT 2 πT 2

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