Derivative of Composite Function when inside derivative is given MCV4U

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A Question I am hoping you can answer. Rory, Martin and Riley are climbing a tree on their Physics is Fun excursion and Riley drops his worksheet which falls onto a branch below them. Rory and Martin sit at different heights on two different branches and, holding Riley’s legs at the ankles, lower him down in the gap between them so that he can reach the worksheet. Because of the way they are arranged there is a 90 degree angle between Riley’s legs. One leg makes an angle of 40 degrees between it and the vertical plane of Rory’s branch. Riley is held in equilibrium and rescues his worksheet. If Riley’s mass is 80kg:
a) Draw a vector diagram representing the forces involved in the above scenario.
b) Calculate the force needed by i) Rory and ii) Martin to hold him in equilibrium.

matthewmcgaughey