# Mathematica not simplifying trig expression [closed]

I type in

hld01[θ_] = (Cos[θ] Subscript[r, Ty])/(Square[Sin[θ]] Square[
Sqrt[Square[Csc[θ]] Square[Subscript[r, Ty]]]])


and wanted Mathematica to simplify, but it doesn't. I tried Simplify[] and get the same result. "Clearly" is should be able to simplify Sqrt[Square[]], right? How to get Mathematics to simplify this expression?

## closed as off-topic by Sektor, Henrik Schumacher, LCarvalho, Coolwater, José Antonio Díaz NavasMar 10 '18 at 19:48

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• Clearly? Maybe so, if you tell Mathematica that the – Oliver Jennrich Mar 10 '18 at 16:14

It is not clear what your expression is supposed to mean. Square[] is not a standard Mathematica function and as long as you haven't defined it, it is difficult for Mathematica to know what its square root is supposed to mean.
hld01[θ_] = (Cos[θ] Subscript[r, Ty])/(Sin[θ]^2 Sqrt[Csc[θ]^2 Subscript[r, Ty]^2]^2)

Cos[θ]/Subscript[r, Ty]