Please:

- function explain the function

- explain the derivative calculations

- find the critical point

- find the maximum or minimum

An isosceles triangle whose equal sides form an angle - and whose third side has length t sits on top of a square with sides of length w as in the diagram below: Assuming the base of the triangle is parallel to the side of the square, what value of w makes the intersection of the square and triangle have the largest area? The value of w will be in terms of t