# (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/6b.

π/6c.

π/2d.

5π/6e.

11π/6Answer:

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