Which of the following strategies could be used to prove the equation below in two steps, including simplification? sin xcot~ x = cos x O A. Factor. O B. Write in terms of sine and cosine. O C. Use a reciprocal identity. O D. Use a Pythagorean identity.The following steps were used to prove m2 a. sin? 9 = sin' gm? 9. I. Factor. ||. Simplify. lll. Use a Pythagorean identity. IV. Use a quotient identity. V. Use a reciprocal identity. In which order were the steps performed? 0 A. I, V, "I, II, IV 0 B. IV, I, V, III, IV, |, V O C. I, III, IV, II, V O D. IV, I, II, V, III, IV, || An incomplete proof of costsin = tan & (1- sin @) is shown. 1 + sin 8 cos sin & cos Usin 8 1-sine 1 + sin 8 1+ sin & 1- sin 8 cos & sin & cos O sin 8 - cos &sina 1 + sin 8 1 - sin a cos & sin a 1 + sin 8 cos sin & sin 8- sin 8 1 + sin 8 cose cos & sin a sin & sina 1 + sin 8 cose cos e cos & sin & = tan 8- sin & tan 8 1 + sin 8 cos & sin & = tan 8 (1- sin 8) 1 + sin 8 Which of the following expressions could be used to complete the third step of the proof? O A. cos8 - sin & sin 8 O B. sin 8(1-cos2 8) costa