Inclined asymptote can be found by calculating the limit of sin(3)^2*x, divided by x at x->+oo and x ->-oo
$$\lim_{x \to -\infty} \sin^{2}{\left(3 \right)} = \sin^{2}{\left(3 \right)}$$
Let's take the limitso,
inclined asymptote equation on the left:
$$y = x \sin^{2}{\left(3 \right)}$$
$$\lim_{x \to \infty} \sin^{2}{\left(3 \right)} = \sin^{2}{\left(3 \right)}$$
Let's take the limitso,
inclined asymptote equation on the right:
$$y = x \sin^{2}{\left(3 \right)}$$