Suppose the population of a certain city is 3987 thousand. It is expected to decrease to 3157 thousand in 50 years. Find the per
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now, notice, there are two valid angles for such a tangent, however, if we look at the complex pair, the "a" is negative and the "b" is positive, that means, "x" is negative and "y" is positive, and that only occurs in the 2nd quadrant, so the angle is in the second quadrant, not on the fourth quadrant.
thus