Show if they converges ar diverges n 2) Show that the alternating series (-1) . is convergent.. 201 +1. n=1 How many terms in the partial sum to Sn do we need in order to find approximate Sum with error less than 0,01 ? 3) Find and classify the critical points of f(xiy). = x + y - 4xy +1 4) Find the equation of the tongent plane and the norma) line to the surface Z= 1.4. arcton (xiy) at the point (1,1,1) IT. M8 A=1 20 +3 -3+2 (5) D * M8 n-2n + 3 -40 + U .