Given the double integral: ย โซ24โซ4๐ฅโ๐ฅ2๐ฅ๐ฆ2(๐ฅ2+๐ฆ2)3/2๐๐ฆ๐๐ฅ, changing the coordinate system, the new limits will be _____.ย Group of answer choices๐: 4cosโก๐to4secโก๐; ๐:ย 0๐ก๐๐/4๐: 4to4secโก๐; ๐:ย 0๐ก๐๐/4๐: 4cosโก๐to4secโก๐; ๐:ย ๐/4๐ก๐๐/2๐: 4cosโก๐to4; ๐:ย 0๐ก๐๐/2 PreviousNext
Question
Given the double integral: ย โซ24โซ4๐ฅโ๐ฅ2๐ฅ๐ฆ2(๐ฅ2+๐ฆ2)3/2๐๐ฆ๐๐ฅ, changing the coordinate system, the new limits will be _____.ย Group of answer choices๐: 4cosโก๐to4secโก๐; ๐:ย 0๐ก๐๐/4๐: 4to4secโก๐; ๐:ย 0๐ก๐๐/4๐: 4cosโก๐to4secโก๐; ๐:ย ๐/4๐ก๐๐/2๐: 4cosโก๐to4; ๐:ย 0๐ก๐๐/2 PreviousNext
Solution
The given double integral is in Cartesian coordinates (x, y). To change the coordinate system to polar coordinates (r, ฮธ), we need to find the new limits of integration.
The given limits for x are from 4 to 2, and for y are from x to x^2.
In polar coordinates, x = rcos(ฮธ) and y = rsin(ฮธ).
Substituting x = 4, we get rcos(ฮธ) = 4. Solving for r, we get r = 4sec(ฮธ).
Substituting x = 2, we get rcos(ฮธ) = 2. Solving for r, we get r = 2sec(ฮธ).
For y = x, we get rsin(ฮธ) = rcos(ฮธ), which simplifies to tan(ฮธ) = 1. Solving for ฮธ, we get ฮธ = ฯ/4.
For y = x^2, we get rsin(ฮธ) = (rcos(ฮธ))^2. This is a more complicated equation, but it simplifies to tan(ฮธ) = cos(ฮธ), which has solutions at ฮธ = 0 and ฮธ = ฯ/2.
So, the new limits of integration in polar coordinates are r: 2sec(ฮธ) to 4sec(ฮธ), and ฮธ: 0 to ฯ/4.
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