(A) Number of solutions of the equation `xe^(sinx) - cosx = 0` in the interval `(0, pi/2)`
(B) Value(s) of k for which the planes kx + 4y + z = 0, 4x + ky + 2z = 0 and 2x + 2y + z = 0 intersect in a straight line
(C) Value(s) of k for which |x - 1| + |x - 2| + |x + 1| + |x + 2| = 4k has integer solution(s)
(D) If y' = y + 1 and y(0) = 1, then value(s) of y(ln 2)
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