Dear Toolnut, you write , ok then the expression: , meaning:

 = 0.86602540

which has arcsin value  which in turn when you multiply by  we get  which you must agree is congruent with himself .

What ever you are trying to prove is wrong, therefore I restored the section to its previous state. Please provide specific x and n, for which this formula fails if you want to reissue you delete. Thanks,