How do you use a calculator to evaluate $cot(1.5pi)$ ?

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Answer 1 · 2017-02-17T01:17:23

Zero

$1.5pi --> 1.5(180^@) = 270^@$
$cot (270) = 1/(tan 270)$
Unit circle gives --> tan 270 = infinity
There for:
cot 270 = 1/(infinity) = 0

How do you use a calculator to evaluate cot(1.5pi)cot(1.5pi)?