The measure of two angles of a triangle are 43 and 38. what is the measure of the third angle?

Step-by-step explanation:

Sum of angles of a triangle  = 180

43 + 38 +x = 180

       81 + x = 180

               x = 180 - 81 = 99

the correct answer is d

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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