Punto de interseccion entre una funcion cualquiera y una o varias rectas verticales

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Buenas, estoy desarrollando un programa para calcular el primer momento de area de cualquier seccion, pero se me presento un problema, y es que necesito saber los puntos de interseccion que hay entre una funcion cualquiera y una o varias lineas verticales. Para el caso de dos funciones no seria complicado, pero una linea vertical no representa una funcion y hasta ahora no se me ocurre como hacerlo. Las lineas verticales representarian las lineas verticales de la forma de una seccion de viga , y pues yo ya localize el centroide del area, entonces defino una funcion constante (una linea horizontal) que cortara a las lineas verticales de la seccion y necesito saber las coordenas "x" de los puntos de corte para poder continuar porque la coordenada "y" ya la tengo pues es la misma que la del centroide. Porfavor, si a alguien se le ocurre algo, le estaria muy agradecido.
Adjunto una imagen por si no me explique bien. GRACIAS.
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KSSV
KSSV 2020년 4월 8일
Google English traslation:
Good, I am developing a program to calculate the first moment of area of ​​any section, but a problem appeared to me, and that is that I need to know the points of intersection that exist between any function and one or more vertical lines. In the case of two functions it would not be complicated, but a vertical line does not represent a function and so far I cannot think of how to do it. The vertical lines would represent the vertical lines of the shape of a beam section, and since I already located the centroid of the area, then I define a constant function (a horizontal line) that will cut the vertical lines of the section and I need to know the coordinates "x" of the cut points to be able to continue because the coordinate "y" I already have it because it is the same as that of the centroid. Please, if someone comes up with something, I would be very grateful.

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KSSV
KSSV 2020년 4월 8일

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