How many times smaller is the value of the 6 in 621 than the value of the 6 in 6420

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.

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

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,