Setup, but do not evaluate, the integral you would use to find the exact length of the spiral r = 1 from θ = to θ = 2.
a) ∫[1, 2] √(1 + (dθ)²) dθ
b) ∫[1, 2] √(1 + (dθ)²) θ
c) ∫[1, 2] √(1 + (dθ)²)
d) ∫[1, 2] √(1 + (dθ)²) θ²