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I don't quite understand what i am supposed to optimize, and what my restriction formula is. Is QT constant? But in that case, how could i optimize PRS?

I tried the following:

[tex]l = PR + RS[/tex]

[tex] PR^2 = PQ^2 + QR^2[/tex]

[tex] cos\theta1= \frac{QR}{PR} [/tex]

[tex] PR = \frac{QR}{cos\theta1} [/tex]

Similarly, [tex] RS = \frac{TR}{cos\theta2} [/tex]

So [tex] l = \frac{TR}{cos\theta2} + \frac{QR}{cos\theta1} [/tex]

But i don't see where this could go.

Thank you.

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# Homework Help: Optimization Problem

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