Which of the following are the factors of t4 – 81? a. (t – 3)(t + 3)(t2 + 9) b. (t – 3)2(t + 3)2 c. (t – 3)(t + 3)2 d. (t2 – 9)(t2 – 9)

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