Which is a correct two column proof. given < 4 and

The initial statement is:    QS = SU   (1)

                                    QR = TU    (2)

We have to probe that:  RS = ST

Take the expression (1):                     QS       =   SU

We multiply both sides by R                (QS)R   =   (SU)R

But    (QS)R = S(QR)     Then:            S(QR)   =   (SU)R     (3)

From the expression (2):  QR = TU. Then, substituting it in to expression (3):

                                                       S(TU)   =   (SU)R     (4)

But  S(TU) = (ST)U  and (SU)R = (RS)U

Then, the expression (4) can be re-written as:

                                                      (ST)U    =    (RS)U

Eliminating U from both sides you have:     (ST) = (RS)    The proof is done.

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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