Please help. I will be constantly asking questions on the app to finish a class and i only have a day

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square