Which of the following completes the missing step to the following proof. costa 1 - sin e 1+ sme L.S.: costa 1 - sin @ = ??? (1 - sin @)(1 + sin e) 1 - sin & = 1+ sme = R.S. O a) cos @ 1 + sin @ 1 - sin @ 1 + sin 9 Ob) Cos B+ sin e 1 - sin & cos'8 sin' e 1 - sin & sin a 1 - sins e O d) 1- sine