Axel Contreras on Instagram: "Sine and cosine don’t come from memorization. They come from geometry. In this video, we break down a right triangle and explain exactly where sine and cosine come from. You’ll see how the angle defines the triangle, how each side gets its role, and why: • sin(θ) = opposite / hypotenuse • cos(θ) = adjacent / hypotenuse No tricks. No shortcuts. Just a clean visual explanation that connects the triangle, the angle, and the ratios that describe it. This is the foundati