In the first step of a proof, the left-hand side of the following identity is factored. sin2 8- cos2 0sin2 8 = sin 4 0 Which fundamental identity is used in the second step of the proof? O A. sing= csc & sin a tan 8 = cos & O C. sin28+ cos20 = 1 O D. 1+ tan20 = sec2 8Simplify the expression. csc' x- 1 1 + sin x O A. csc x + 1 O B. csc x(csc x- 1) O C. sin2x - csc x O D. csc x- cosxtan xAn incomplete proof of 1- tan & cos 8 - = cos & is shown. csc 8 sin a 1-L tan & cos e cos a =1- cos a csco csc 8 1- tan Ocos 8 csce 1- tan & cos & csco = 1- sin & sin a 1- tan &cos a =1- sina csce 1- tan & cos & = cos a csco Which of the following expressions could be used to complete the second step of the proof? O A. 1- cos@cosa O B. 1-sin2 Ocos2 8 O C. 1 1_ Sin @ csc 8 cos e O D. sin a csceWhich of the following expressions can be used to complete the equation below? sec x = 1+ cot x O A. tan x O B. tan x O C. tan x cos x O D. tan x sin x