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 ...

2. Determine the roots of the equation \(\sqrt 5 \sin x + 2\cos x = 0\) in the interval \(0 \le x \le 2\pi\) 3. Sketch the graph of \(y = \sqrt 5 \sin x + 2\cos x\) for \(0 \le x \le 2\pi\) 4.

Let's remind ourselves of what the sine graph looks like so that we can ... 90° and the other between 90° and 180°. \(\sin x^\circ = \frac{3}{4}\) Since this is sin and is positive this means ...