(153.45+4.35-142.7 sin30)/(142.7 cos30 )-(153.45-142.7 sin30)/(142.7 cos30 )
https://www.wolframalpha.com/input/?i=(153.45%2B4.35-142.7+sin%E2%81%A130)%2F(142.7+cos%E2%81%A130+)-(153.45-142.7+sin%E2%81%A130)%2F(142.7+cos%E2%81%A130+)