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Question: how to reverse operation of convert(expr,tan); ?

Question:how to reverse operation of convert(expr,tan); ?

nm 9899 Maple 2022
simplification trig combine
September 21 2022
1

Given

expr:=c[2]*sin(sqrt(3)*x/2) + c[3]*cos(sqrt(3)*x/2);
expr:=convert(expr,tan);

How to change the second result above (with the tan) back the the original form it was in?

I tried all different convert and simplification commands, and non managed to get back the original form.

convert(expr,sincos);
simplify(expr,size);
#etc...

Maple 2022.1 on windows 10
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