If a || b and then a || c

b || c

Step-by-step explanation:

If a is parallel to b and a is parallel to c, then b has to be parallel to c

this shows a reflection over the x-axis and is translated one unit down and 6 units to the right (x + 6, y - 1)

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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