15 pts Question 7 1 + cos sin One possible way to simplify is shown. sin a 1 + Cos I Choose the correct substitution in each of the steps below. 1 + cost sin x Simplify: sin r 1 + cos Where A = 1 + cos x sin a Step 1: + [ Select ] sin x 1 + cos x 1 - cos x 1 + cos x sin r . A Step 2: sin a 1 - cos2 x Where B - 1 + cos x sing - sinc cost Step 3: sin r B [ Select Where C = sing sing cosa Step 4: C 1 + cost sin x B [Select] Step 5: sin x + sin x cos x sin -sin r cos B B Where D = Step 6: D B [ Select ] Where E - Step 7: E [ Select ]