15. \( y=\tan \left(\frac{2-x}{2+x}\right) \)
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Bonus Knowledge
Did you know that the tangent function, which forms the core of your equation, has an intriguing historical background? It was first extensively studied by Indian mathematicians around the 7th century, with a lot of early notation and concepts evolving in the Islamic Golden Age. This rich history highlights how crucial trigonometric functions have been in developing mathematics as we know it today! Now, let's spice it up with a real-world application! The tangential functions, like the one in your equation, are essential in fields like engineering and physics, especially when dealing with waves and oscillations. For example, engineers use tangent functions to model the behavior of pendulums or to design safe roller coasters, ensuring that each thrilling drop and twist is calculated perfectly. Who knew math could lead to so much excitement?