(3x - 5 - 7x^2) - (-2 + 6x^2 - 5x)
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if you do a quick calculation on what that angle is, you'll notice that it is exactly 1 radian, and an angle of 1 radian, has an arc that is the same length as its radius.
that's pretty much what one-radian stands for, an angle, whose arc is the same length as its radius.