1 - sec 0 tan 0 Establish the identity = 2 cot 0. tan 0 1 - sec 0 Which of the following shows the key steps in establishing the identity? 1 - sec 0 tan 0 2 OA (1 - sec 0)- - tan 2 0 tan 0 1 - sec 0 tan 0(1 - sec 0) = 2 cot 0 sec 0 1 - sec 0 tan O (1 - sec 0)-- tan 2 0 2(1 - sec 0) O B. tan 0 1 - sec 0 tan 0(1 - sec 0) = 2 cot 0 tan 0(1 - sec () 1 - sec 0 tan 0 OC. (1 + sec 0)-- tan - 0 2 tan O 1 - sec 0 tan 0(1 + sec 0) = 2 cot 0 sec 0 1 - sec 0 tan 0 (1 + sec 0)- - tan 2 0 OD. 2(1 + tan 0) tan 0 1 - sec 0 tan 0(1 + sec 0) sec 0(1 + tan 0) = 2 cot 0