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?
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?
Solution
The distance between a point in polar coordinates and the origin is simply the radial coordinate r. In this case, r = f(θ) = 1 + 2cosθ.
To find when this distance is decreasing, we need to find when the derivative of r with respect to θ is less than 0.
The derivative of r = 1 + 2cosθ with respect to θ is -2sinθ.
Setting -2sinθ < 0 gives sinθ > 0.
The sine function is positive in the first and second quadrants, which corresponds to the interval 0 < θ < π in radians, or 0 < θ < 180 in degrees.
Therefore, the distance between the point with polar coordinates (f(θ), θ) and the origin is decreasing on the interval 0 < θ < π (or 0 < θ < 180 degrees).
Similar Questions
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