Which element has the electron configuration [Xe] 652 4445010 6p?? O A. gold (atomic number 79)
OB.
mercury (atomic number 80)
O C.
lead (atomic number 82)
D.
potassium (atomic number 19)
E.
copper (atomic number 29)
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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