Find the equation of tangent to the circle x² + y² − 2ax = 0 at the point (a(1 + cos α), a sin α)
A. x cos α + y sin α = a(1 + cos α)
B. x sin α + y cos α = a(1 + cos α)
C. None of these.
D. x cos α − y sin α = a(1 + sin α)