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symbolic simplification to a function

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Odien
Odien 2015-8-13
关闭： MATLAB Answer Bot 2021-8-20
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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