H is a trigonometric function of the form h(x) = a cosbx + c) + d. Below is the graph of h(x). The function has a maximum point at (3,6) and a minimum point at (6.5, -9).
Find a formula for h(x). Give an exact expression.

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.