V 7. Corey determines that the cosine of an angle a in the third quadrant is equal to E and the cosine of an angle [i in the fourth quadrant is equal to E. Which of these is equal to sin(a + B) _ 63 _ 33 A. s1n(a+)=E 3- s1n(a+')=E 63 33 C. sin(a+)= 0- sin(a+,8)= 65 65