$\"\"$

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The polar equation is $\"\"$ .

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$\"\"$

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Trigonometric formula : $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Multiply each side by $\"\"$ .

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$\"\"$

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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The graph of this equation is a circle with a center $\"\"$ .

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Evaluate the function for several values of $\"\"$ in its domain and use this points to graph the function.

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Graph:

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(1) Draw the coordinate plane.

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(2) Graph the function $\"\"$ : \ \

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$\"\"$

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$\"\"$

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The rectangular equation is $\"\"$ .

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Graph of the function $\"\"$ is \ \

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$\"\"$ .