Maximizing Triangle Area with Given Adjacent Sides

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Homework Statement


A triangle has adjacent sides 4 cm and 6 cm. Find the angle contained by the sides which maximizes the area.


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The Attempt at a Solution


I'm not going to lie. I have no idea how to start this. I tried using sine law to create a helper equation but that gave me Four unknowns.
 
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You need an equation that relates area of the triangle to the angle.
 

Thread 'Finding the nth roots of a complex number'

There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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