Establish the identity. csc 0 sec (20) = c²e-2 CsC Choose the sequence of steps below that verifies the identity. csc 20 OA sec (28) =- 1-2 sin20 2- csc 20 Csc0- csc 20-2 csc 20 sec (20)= 1 1 cos 20- sin20 Ccsc 20 %3D sece- csc c20 sec?e csc 20 csce sec e csc 20 - 2 Oc ec (20) = 1-2 sin20 1- sc²e 2 c²e-2 csc csc20-2

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