Answer:
36 degrees
Step-by-step explanation:
Subtract 54 from 90
First, we get rid of the negative exponent in the parenthesis. We do this by moving it to the top. Our equation is now:

Next, we can cross out one n from both the top and the bottom.

Finally, we evaluate the -2
Our equation becomes:

This becomes:

This can not be simplified any further, so this is the final answer.