Express the polar equation \(r=\cos 2\theta\) in rectangular coordinates. Find the maximum height above the \(x\)-axis of the cardioid \(r=1+\cos \theta\text{.}\) Sketch the graph of the curve whose ...

Everybody and their mother has brought an activity tracker to market in the last year, but it actually makes sense that Polar—a company with a long history making heart rate monitors—would get into ...