symbolic simplification to a function

from basic trigo formula
sec^2 x = 1+tan^2 x
in matlab
sym('x')
trigo = 1 + tan(x)^2
simplify(trigo) will give the same answer instead of sec^2 x. Why?

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Asked:

on 13 Aug 2015

Closed:

on 20 Aug 2021

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