The calculator won't let me do anything. I need to evaluate csc 4pi/3

$${csc}{\left({\frac{{\mathtt{4}}{\mathtt{\,\times\,}}{\mathtt{\pi}}}{{\mathtt{3}}}}\right)} = {\mathtt{13.690\: \!552\: \!090\: \!676\: \!954\: \!5}}$$

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