Q. Find the reference angle for a rotation of 127π.Answer:
Understand reference angle: Understand the concept of a reference angle.A reference angle is the acute angle formed by the terminal side of an angle and the x-axis. It is always between 0 and π/2 radians (or 0 and 90∘).
Determine angle quadrant: Determine the quadrant in which the angle (7π)/(12) radians lies.Since (7π)/(12) is more than π/2 but less than π, the angle lies in the second quadrant.
Calculate reference angle: Calculate the reference angle for (7π)/(12) radians.The reference angle in the second quadrant is π−angle. So, we subtract (7π)/(12) from π to find the reference angle.π−(7π)/(12)=(12π)/(12)−(7π)/(12)=(5π)/(12)
Verify correct range: Verify that the reference angle is in the correct range.The reference angle (5π)/(12) is between 0 and π/2, which is correct for a reference angle.