Wronskian of $$$\cosh{\left(x \right)}$$$, $$$\sinh{\left(x \right)}$$$, $$$\cos{\left(x \right)}$$$, $$$\sin{\left(x \right)}$$$
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Calculate the Wronskian of $$$\left\{f_{1} = \cosh{\left(x \right)}, f_{2} = \sinh{\left(x \right)}, f_{3} = \cos{\left(x \right)}, f_{4} = \sin{\left(x \right)}\right\}$$$.
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