The "washer sieve method" of integration, which finds the volume of a solid of revolution with a hole in the middle by integrating the areas of cross-sectional "washers". The method involves finding the outer and inner radii of the washers, denoted as R(x) and r(x), respectively, and using the formula V = π ∫ [R(x)² – r(x)²] dx to sum the volumes of these thin washers and find the total volume. #fbreels #ytshorts #mathskills #maths #trendingreel #trigonometry #mathschallenge #calculus #mathemati