The polar function r = f(q ) , where f(q ) = 1 + 2 cos q , is graphed in the polar coordinate system for0 On which of the following intervals of q is the distance between the point with polarcoordinates ( f (q ),q ) and the origin decreasing?(A) (0, 2.094 ) only(B) (2.094, 4.189 )(C) ((D) (
Question
The polar function r = f(q ) , where f(q ) = 1 + 2 cos q , is graphed in the polar coordinate system for0 On which of the following intervals of q is the distance between the point with polarcoordinates ( f (q ),q ) and the origin decreasing?(A) (0, 2.094 ) only(B) (2.094, 4.189 )(C) ((D) (
Solution
The distance between the point with polar coordinates (f(θ), θ) and the origin is given by the function f(θ) = 1 + 2 cos θ.
To find where this distance is decreasing, we need to find where the derivative of this function is negative.
The derivative of f(θ) with respect to θ is -2 sin θ.
The function -2 sin θ is negative when θ is in the interval (π/2, 3π/2).
However, we are only considering the interval from 0 to 2π, so we need to find the intersection of these two intervals.
The intersection of (π/2, 3π/2) and (0, 2π) is (π/2, 3π/2), which is approximately (1.57, 4.71) in decimal form.
Therefore, the distance between the point with polar coordinates (f(θ), θ) and the origin is decreasing on the interval (π/2, 3π/2), or in decimal form, (1.57, 4.71).
This interval is not listed in the answer choices, so there may be a mistake in the question or the answer choices.
Similar Questions
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