How do you find cos 0?
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Multiplying an even number of negative numbers gives an answer that is choose from:

Simply 8x squared + 5(7x squared- x) - 2x =

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.