2  (x^3)  -  3  (x^2) - 2  x + 1 = 
      0

Plot[2  (x^3)  -  3  (x^2) - 2  x + 1, {x, -2, 2}]

Solve[2  (x^3)  -  3  (x^2) - 2  x + 1 == 0,  x]

N[(1/2) + ((((9 + 2 I (Sqrt[237])))^(1/3))/(2 (3^(2/3)))) + (7/(2 (((3 (9 + 2 I (Sqrt[237]))))^(1/3)))), 
      3]

N[(1/2) - (((1 + I (Sqrt[3])) (((9 + 2 I (Sqrt[237])))^(1/3)))/(4 (3^(2/3)))) - ((7 (1 - I (Sqrt[3])))/(4 (((3 (9 + 2 I (Sqrt[237]))))^(1/3)))), 
      3]

N[(1/2) - (((1 - I (Sqrt[3])) (((9 + 2 I (Sqrt[237])))^(1/3)))/(4 (3^(2/3)))) - ((7 (1 + I (Sqrt[3])))/(4 (((3 (9 + 2 I (Sqrt[237]))))^(1/3)))), 
      2]

2  (x^3)  -  3  (x^2) - 2  x + 1 /. {x -> -0.744644}

Maatriksid

A = {{2, 1, 0}, {0, 1, 0},  {1, 0, 3}}

Tr[A]

Det[A]

Inverse[A]

LinearSolve[A, {a, 0, 0}]

∫Sin[b*x] \[DifferentialD]x

(∫_0^Pi) Sin[b*x]  \[DifferentialD]x

(∑_(k  =  1)^n) (k^3)

DSolve[y'[x] == 2  y[x], y[x], x]

DSolve[{y'[x] == 2  y[x], y[0] == 2}, y[x], 
      x]