Expression component using trigonometry calculates incorrect results

Hi, I just wanted to calculate the hypotenuse of a few triangles. unfortunately I can not find out where the problem is.

It looks like you’re mixing up
(x/2)/(cos (a/2) )
and
(x/2)/( (cos(a)) / 2)

Thx for the reply.
But no… it represents the half of an angle…

No… you were right!!!

Just transferred it wrong… That cost me an hour…!
Thx…

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