Part 2 of Basic Trigonometry. This video contains more examples.
A short introduction to trigonometry. Among other things, the sine, cosine and the tangent is covered. We also get to learn about the famous mnemonic for remembering the relationships between them (in terms of being adjacent or opposite), namely: sohcahtoa or so cah toa. An introductory video to start out with if you’re new to trigonometry.