Set up integrals (no need to solve them) without absolute value signs, for the area of the triangle with vertices.
a. ∫[a, b] 0.5 (f(x) - g(x)) dx, where f(x) and g(x) are the y-coordinates of the vertices.
b. ∫[c, d] (h(y) - k(y)) dy, where h(y) and k(y) are the x-coordinates of the vertices.
c. ∬[p, q] 0.5 (r(θ) - s(θ)) r dθ dφ, where r(θ) and s(θ) are polar coordinates of the vertices.
d. ∬[m, n] 0.5 (p(u) - q(u)) du dv, where p(u) and q(u) are parametric equations of the vertices.
