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Ok, I have a cubic function, y=(x-6)(x-1)(x-9) or y = x^{3}-16x^{2}+69x-54

I then have four tangents to make a quadrilateral, the tangents are as follows.

y=7.75x+14.75

y=-6.25x+56.25

y=7.75x + -76.231

y=-6.25x + 31.602

I need to find the area inside the tangents, except I have no idea where to start, Thankyou for any help in advance.

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# Area inside 4 tangents

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