import openturns as ot
import openturns.viewer as otv

f1 = ot.SymbolicFunction(["x"], ["sin(x)"])
f2 = ot.SymbolicFunction(["x"], ["x"])

f = f1 * f2
graph = f.draw(0.0, 10.0)
graph.setTitle("y=f1*f2")
otv.View(graph, figure_kw={"figsize": (8, 4)}, add_legend=True)