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Sagot :
To memorize the position of this points in the unit circle we have to remember that pi is equal to 180°. This means that pi is on the negative x-axis.
Once we memorize this we only need to remember that we have to move in 90 degrees.
Then pi/2 is in the positive y-axis.
3pi/2 ins in the negative y-axis.
2pi is in the positive x-axis.
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