Here you can visualize the slope of any point on a curve. You may adjust the derivative at x = ? variable to change where the tangent line intersects the curve. You can also see inside the project to change the function entirely. (I made a comment on the function you want to edit)
For now, the default function shown is 100sin(x). The red dot is where the line intersects the curve. The slope and angle variable will not be exact. look out for new coming project: integrals visualized SKIBIDI TOILET!!!