how to make x(t) a real function in matlab symbolics?

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I have a rotation matrix (R) in which I used elements such as sin(x(t)),
to do this I have defined x and t as syms t real x=sym('x(t)')
From this definition, MATLAB knows that t is a real number but does not understand that x is also a real number. because when I calculate transpose of the rotation matrix (R') it gives me
how to make MATLAB understand that all of my functions are real valued functions?
Thanks Ehsan

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