Inclined asymptote can be found by calculating the limit of sqrt(((12*sin((157*x/50)/50000) - 6*sin((157*x/50)/25000))/(((157*4/50)*x)))^2 + ((18 - 18*sin((157*x/50)/25000))/(((157*4/50)*x)))^2), divided by x at x->+oo and x ->-oo
$$\lim_{x \to -\infty}\left(\frac{\sqrt{\left(\frac{18 - 18 \sin{\left(\frac{\frac{157}{50} x}{25000} \right)}}{\frac{4 \cdot 157}{50} x}\right)^{2} + \left(\frac{12 \sin{\left(\frac{\frac{157}{50} x}{50000} \right)} - 6 \sin{\left(\frac{\frac{157}{50} x}{25000} \right)}}{\frac{4 \cdot 157}{50} x}\right)^{2}}}{x}\right) = 0$$
Let's take the limitso,
inclined coincides with the horizontal asymptote on the right
$$\lim_{x \to \infty}\left(\frac{\sqrt{\left(\frac{18 - 18 \sin{\left(\frac{\frac{157}{50} x}{25000} \right)}}{\frac{4 \cdot 157}{50} x}\right)^{2} + \left(\frac{12 \sin{\left(\frac{\frac{157}{50} x}{50000} \right)} - 6 \sin{\left(\frac{\frac{157}{50} x}{25000} \right)}}{\frac{4 \cdot 157}{50} x}\right)^{2}}}{x}\right) = 0$$
Let's take the limitso,
inclined coincides with the horizontal asymptote on the left