video1.0<iframe src="https://www.loom.com/embed/fd64076515694f4a9e4e40b9f34fd262" frameborder="0" width="960" height="720" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>720960Loomhttps://www.loom.com720960https://cdn.loom.com/sessions/thumbnails/fd64076515694f4a9e4e40b9f34fd262-00001.jpg67p: In the figure, triangles ABC and DBE are right triangles. What is cos B?