This lesson gives an introduction to trigonometric proofs. Part 1 of 2.

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E2 E1 Sn2 Sn1 Reactions Example 3 More free lessons at: http://www.khanacademy.org/video?v=MtwvLru62Qw

Find the coordinates of the midpoint of the segment PQ

An oval track is made by erecting semicircles on each end of a 60m by 120m rectangle. Find the length of the track and the area enclosed by the track.

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