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Plot the point [tex]\left(4, \frac{7 \pi}{6}\right)[/tex], given in polar coordinates, and find other polar coordinates [tex](r, \theta)[/tex] of the point for which the following are true:

(a) [tex]r \ \textgreater \ 0, -2 \pi \leq \theta \ \textless \ 0[/tex]

(b) [tex]r \ \textless \ 0, 0 \leq \theta \ \textless \ 2 \pi[/tex]

(c) [tex]r \ \textgreater \ 0, 2 \pi \leq \theta \ \textless \ 4 \pi[/tex]

(a) What are the coordinates of the point for which [tex]r \ \textgreater \ 0, -2 \pi \leq \theta \ \textless \ 0[/tex]?

(Type an ordered pair. Type an exact answer using [tex]\pi[/tex] as needed. Use integers or fractions for any numbers in the expression. Simplify your answer.)


Sagot :

Given the point \(\left(4, \frac{7 \pi}{6}\right)\) in polar coordinates, we need to find other polar coordinates \((r, \theta)\) for the point under three different conditions:

### (a) \(r > 0, -2\pi \leq \theta < 0\)
First, we need to transform \(\theta = \frac{7\pi}{6}\) to fit within the range \(-2\pi \leq \theta < 0\).

By subtracting \(2\pi\) from \(\theta\),
[tex]\[ \theta_a = \frac{7 \pi}{6} - 2\pi = \frac{7\pi}{6} - \frac{12\pi}{6} = \frac{-5\pi}{6} \][/tex]
So, the coordinates are:
[tex]\[ (4, -\frac{5\pi}{6}) \][/tex]

### (b) \(r < 0, 0 \leq \theta < 2\pi\)
For a negative radius, \(r\), we need to add \(\pi\) to \(\theta\) to adjust the angle appropriately.

[tex]\[ r_b = -4 \][/tex]
[tex]\[ \theta_b = \frac{7\pi}{6} + \pi = \frac{7\pi}{6} + \frac{6\pi}{6} = \frac{13\pi}{6} \][/tex]
Since \(\frac{13\pi}{6}\) is within \(0\) to \(2\pi\) (as \(\frac{13\pi}{6} \approx 6.8068\)), the coordinates are:
[tex]\[ (-4, \frac{13\pi}{6}) \][/tex]

### (c) \(r > 0, 2\pi \leq \theta < 4\pi\)
For a positive radius \(r\) where \(\theta\) is within the range \(2\pi \leq \theta < 4\pi\), we add \(2\pi\) to \(\theta\).

[tex]\[ \theta_c = \frac{7\pi}{6} + 2\pi = \frac{7\pi}{6} + \frac{12\pi}{6} = \frac{19\pi}{6} \][/tex]
Since \(\frac{19\pi}{6}\) is within the required range (as \(\frac{19\pi}{6} \approx 9.9484\)), the coordinates are:
[tex]\[ (4, \frac{19\pi}{6}) \][/tex]

To summarize:

(a) For \(r > 0, -2\pi \leq \theta < 0\): \((4, -\frac{5\pi}{6})\)

(b) For \(r < 0, 0 \leq \theta < 2\pi\): \((-4, \frac{13\pi}{6})\)

(c) For [tex]\(r > 0, 2\pi \leq \theta < 4\pi\)[/tex]: [tex]\((4, \frac{19\pi}{6})\)[/tex]
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