The perimeter of a certain type of machine part can be described by the equation r a sin b cos(a 0, b 0) Explain why all such machine parts are circular

Question: The perimeter of a certain type of machine part can be described by the equation r = a sin + b cos(a > 0, b

The perimeter of a certain type of machine part can be described by the equation r = a sinθ + b cosθ(a > 0, b > 0). Explain why all such machine parts are circular.

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