MathAction Pattern Matching

Topics

Say, I have

fricas

test:=D(sin(z)^2, z)

$\label{eq1}2 \ {\cos \left({z}\right)}\ {\sin \left({z}\right)}$

Type: Expression(Integer)

What is the easiest way to see, if the output has sin(z) ?

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member?(sin(z),kernels(test))

$\label{eq2} \mbox{\rm true}$

Type: Boolean