It is given that trapezoid EFGH is an isosceles trapezoid. We know that FE ≅ GH by the definition of
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It looks like
(If the limits are in the wrong order, just multiply the result by -1)
Split the integral at an arbitrary value between
and 
, and write 
as
Then by the FTC,
(If the limits are in the wrong order, just multiply the result by -1)
Split the integral at an arbitrary value between
Then by the FTC,