mathematics - Make 6 5 4 3 = 81

Can you find a way to make:

6 5 4 3 = 81

by concatenation and/or adding any of (and only) these mathematical operators:

• +


• -



• ×


• !


• ÷


• ^


• standard parentheses ()

You cannot add other numbers to the equation, or re-order the existing numbers.
The result must be a mathematical equality.

Harder version...

Try to do it while only altering the left hand side!

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Inspired by Make 5 5 5 5 = 19

Hopefully somewhat more challenging than my previous attempt (may be hard not to be!)

Answer

I thought a bit too much but I finally got it:

$\frac{6+5!*4}{3!}=81$