Which formula gives the x-coordinates of the maximum values for y = cos(x)? kr for any integerk
O ko for k = 0,12,14,...
ks
o 2 for any positive integer k
o the ta for k= 0,32,34...
Help!?

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.