I need to show whether or not the following function is increasing, decreasing, or constant returns to scale, but I can't figure out how to extract the *t* from it when it is put in the form $y(tX\_1, tX\_2)$.
$$
y = X\_2\sin{\left(\frac{X\_1}{X\_2}-\pi \right)}
$$
Is there any other way of showing IRS, DRS, and CRS? Any help would be appreciated!