Suppose A = dy/dx for the curve x2 + y2 = 4 at (√2, √2), B = dy/dx for the curve siny + sinx = sinx . siny at (π, π) and C = dy/dx for the curve 2exy - exey - ex - ey = exy - 1 at (1, 1), then (A + B + C) has the value equal-to
(A) - 1
(B) e
(C) - 3
(D) 0