This precalculus video tutorial explains how to convert rectangular equations to polar equations. This video contains plenty of examples and practice problems. It provides all of the formulas that you need to convert a rectangular cartesian equation into polar form using trigonometric functions such as sin, cos, tan, sec, csc, and cot. Trigonometry - Free Formula Sheet: Trigonometry Final Exam Review: Trigonometry Video Lessons: Final Exam and Test Prep Videos: