Mathematics is just crazy! You need to see this

I must confess to you, Mathematics has been given me a lot of problems right from my elementary school, At times Mathematics is very simple but as a lot of trick and funny at times.
So i had to take my times to work some stupid work out...
So just check this simple mathematics and tell me your result?

Solve K = 1 + sin x/n

See my own calculations on a working paper with my answer.