Question 4

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