Establish the identity. (1 - cos 20) csc 20=1 Which of the following shows the key steps in establishing the identity? ○ A. (1- cos 20) csc 20 = cot 20 csc 20= 1 2. CSC 20 = sin 20 =1 tan 0 sin 20 O B. (1- cos 20) csc 20 sec 20- sin 20- 1 = = csc 20- cot 20=1 Cos 20 ○ C. (1- cos 20) s20) csc 20 = csc 20- cos 20 csc 20= csc 20- cot 20=1 ○ D. (1- cos 20) csc 20= sin 20 csc 20= 1 cos 20 2. csc 20= sin 20 = 1 2 sine