Verify the following identity. 1 - tan 0 cos 20 = 1 + tan 12 0 Which of the following four statements establishes the identity? 1 - tan 20 1 - tan2 0 O A. cos 20 =2 sin 0 cos 0= CSC 20 1 + tan e 1 - tan -0 1 - tan 20 O B. cos 20 = cos 20 - sin 2 0= csc 2 0 1 + tan 2 0 O C. cos 20 = cos 20 - sin 2 _1- tan 0 1 - tan A sec 0 1 + tan - 0 O D. cos 20 =2 sin Ocos 0= _ tan e 1 - tan e sec e 1 + tan e