feat: chain rule

src/modules/math.py

@@ -55,6 +55,17 @@ def t_calculate_e_limit():
 def t_calculate_derivative(f, x, step_size):
 	return (f(x + step_size) - f(x)) / (x +step_size - x)
 
+def t_build_derivative_from_limit(f):
+	x, s = symbols("x s")
+	slope_f = (f.subs(x, x + s) - f) / (x + s - x) # Slope function
+	return limit(slope_f, s, 0)
+
+def t_calculate_derivative_limit(f, x_target):
+	x = symbols("x")
+	slope_f = t_build_derivative_from_limit(f)
+	return slope_f.subs(x, x_target)
+
+
 def t_build_derivate(f):
 	return diff(f)