I need some help plzz

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

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

How do you write something in scientific notation?