Trigonometry Values Pi/2

$\displaystyle \sin\left({\pi\over 2}\right)$	$\textstyle =$	$\displaystyle 1$	(1)
$\displaystyle \cos\left({\pi\over 2}\right)$	$\textstyle =$	$\displaystyle 0$	(2)
$\displaystyle \tan\left({\pi\over 2}\right)$	$\textstyle =$	$\displaystyle \infty$	(3)
$\displaystyle \csc\left({\pi\over 2}\right)$	$\textstyle =$	$\displaystyle 1$	(4)
$\displaystyle \sec\left({\pi\over 2}\right)$	$\textstyle =$	$\displaystyle \infty$	(5)
$\displaystyle \cot\left({\pi\over 2}\right)$	$\textstyle =$	$\displaystyle 0.$	(6)