>>> from comportament import pendent_secant

---- inici

>>> round(pendent_secant(0, 1), 3)
-0.475
>>> round(pendent_secant(1, 2), 3)
0.878
>>> round(pendent_secant(1.5, 2), 3)
3.279
>>> round(pendent_secant(1.9, 2), 3)
73.79
>>> round(pendent_secant(2, 2.1), 3)
68.861
>>> round(pendent_secant(2, 2.5), 3)
2.323
>>> round(pendent_secant(2, 3), 3)
0.444

---- fi

>>> round(pendent_secant(-1, -2), 3)
-0.182
>>> round(pendent_secant(-1.5, -2), 3)
-0.292
>>> round(pendent_secant(-1.9, -2), 3)
-4.746
>>> round(pendent_secant(-1.99, -2), 3)
-472.498
>>> round(pendent_secant(-2, -2.01), 3)
-474.271
>>> round(pendent_secant(-2, -2.1), 3)
-4.915
>>> round(pendent_secant(-2, -2.5), 3)
-0.283
>>> round(pendent_secant(-2, -3), 3)
-0.11