ΘΕΜΑ 1
ΘΕΜΑ 2(2) 
Limit[((x-4)/((x^2)-16)),x->4]
Limit[(Sqrt[(x^2)-4x+1])-x,x->4]

ΘΕΜΑ 2 (2)
Series[(Sqrt[x]),{x,4,3}]

ΘΕΜΑ 4

Integrate[5×(x^(2/3)),x]

Integrate [(xe^x),x]

Integrate[(1/(Sqrt[1+(x^2)])),x]