Inclined asymptote can be found by calculating the limit of cos(7*x) + cos(3*x), divided by x at x->+oo and x ->-oo
x→−∞lim(xcos(3x)+cos(7x))=0Let's take the limitso,
inclined coincides with the horizontal asymptote on the right
x→∞lim(xcos(3x)+cos(7x))=0Let's take the limitso,
inclined coincides with the horizontal asymptote on the left