Suggest a substitution or transformation that will simplify the following integrands, and find their Jacobians.
Use u and v as the substitution variables.
∬ᵣ (4x+2y) sin (x-3y) dA
Start with
u = (4x+2y)
v = (x-3y)
give the subtitution for x and y:
x = ___
y = ___
Find the absolute value of the Jacobians.