Establish the identity. sec zo sec (20) = 2 - sec 20 Choose the sequence of steps below that verifies the identity. sec 20 O A sec (20)= 2 cos -0-1 2 1 - sec 20 2 - sec 20 sec 20 sec 20 sec (20) = sec 20 B. 2 cos 20-1 2 2- sec 20 2- sec 20 sec -0 sec 40 sec (20) = sec -0 O c. 1 - 2 sin 20 2 csc 20-1 2- sec 20 2 csc 20 2 csc 20