A Quick Review of Working with sine, cosine, tangent Sine, Cosine and Tangent Let's start with a quick review of the three trigonometric functions we already understand. Remember that these functions work only in right triangles.https://www.youtube.com/watch?v=O74LFU4VmlEExample: In right triangle ABC, hypotenuse length AB=15 and angle A=35º. Find leg length BC to … [Read more...] about A Quick Review of Working with sine, cosine, tangent