equation solving - After NumberForm I cannot apply a Sine function. Why?

After NumberForm I cannot apply a Sine function. Why?

This works:

sol1 = x /. Solve[x^2 - 3 == 0, x]
Sin[sol1]

Output = $\{-Sin[\sqrt{3}],Sin[\sqrt{3}]\}$

Also this works:

sol2 = x /. Solve[x^2 - 3 == 0, x] // N
Sin[sol2]

Output = $\{-0.987027,0.987027\}$

Then why doesn't this work? Meaning, why is Sin[] not applied to the elements of the list?

sol3 = NumberForm[x /. Solve[x^2 - 3 == 0, x] // N, 6]
Sin[sol3]

Output = $Sin[\{-1.73205,1.73205\}]$

What can I do to make this work?

Comments

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