Gradient of the curve at x = 3 is;
dy/dx = (-19/20)
It implies;
Area yellow exactly in square unit decimal is;
Area triangle with height (5/(4sin(atan(19/20)))) unit and base (5/(4sin(atan(20/19)))) unit
= ½*(5/(4sin43.5311992856))*(5/(4sin46.4688007144))
= ½*1.81488345054*1.72413927802
= 1.56455592105 square unit
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