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# (Originais Teachy 2023) - Question Medium of Math

In a Physics experiment, a student observes the motion of a pendulum that oscillates in an arc of a circle. He notices that the angle formed between the pendulum string and the vertical is x radians at the beginning of the motion. The student then records that at a given moment of the motion, the formed angle is three times the initial angle. Considering that the sine of the triple angle is equal to -1/2, what is the value of x?
a.
7π/6
b.
π/6
c.
π/2
d.
5π/6
e.
11π/6

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