Question

sin ? = 7/12

Answer 1

use ur calculator enter (7/12) then sin-1 or arcsin on some calculators then '=' or 'exe'.
also some calculators require them to be entered in revers eorder to the above

Answer 2

what you are calculating is the angle whose sine is 7/12

Answer 3

x = arcsin ( 7/12) = 35.7 degree