What is the measure of ∠BCE, in degrees, in the figure shown?

25 degrees

Step-by-step explanation:

So a triangles angels equal 180 degrees

So for angel ECD 180 - (15+90) = 75

Straight lines also always equal to 180 degrees so

180 - (80+75) = 25

C: 180°-90°-15°= 75°

B: 180°-90°-80°= 10°

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step-by-step explanation:

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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