1. At what point does the normal line to the curve x^2 - XY + Y^2 = 3 at the point (1,1) intersect the curve again?

Question

2. Find the constants A, B so that if Y = Asin X = B cos X, then Y satisfies the differential equation Y" + 2Y = 0.

3. Find the points om he graph of Y - e^x - e^2x at which that tangent line is horizontal.

Answer 1

(1,1) is not on that curve.

the other questions also have typos.