Question

how does this work? anyone help

Answer 1

At \(\cos\theta = 0\), you have this triangle, right?

If \(\cos\theta\) goes to negative number (when \(\theta\) is greater than \(90^o\)), then triangle will become obtuse, hence \(a\) being longer, right?

So that would make \(a^2 > b^2+c^2\), right?