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## Homework Statement

A "big screen" AB of height L is placed at a height h above a point C on the ground as shown (in the attachment). A person wishes to sit on the ground at a point D in order to watch a video on the big screen. She wishes to sit at a horizontal distance x away from C which gives her the best view. This means that she wishes to sit at a value of x which maximises the viewing angle . If L = 16.2m and h = 7.7m, find this value of x.

## Homework Equations

## The Attempt at a Solution

i know i have to get an equation which i can then differentiate but im not sure how to get this equation and what i would then differentiate with respect to.