Which relation defined by a set of ordered pairs is a function? a {(2, 6), (3, 6), (4, 5), (6, 6), (6, 7)} b {(6, 2), (6, 3), (5, 4), (6, 6), (7, 6)} c {(2, 6), (3, 6), (4, 5), (6, 6), (7, 6)} d {(–2, 6), (3, –6), (–4, 5), (6, –6), (6, –7)}

answer: it's a

step-by-step explanation:

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2