What is the value of sin (5π / 6) ?
Solution: Choice C is correct.
Sin(5π/6) = sin(π- π/6) = sin(π/6) = ½.
Sin(5π/6) = sin (150°) ( by substituting π radians = 180°)
Now 150° lies in the second quadrant, and sin is positive in second quadrant.
Therefore, options A and B can be ruled out.
Also the value of sin always lies between -1 and 1.
Therefore option D can be ruled out.