Türev: Tek ve Çok Değişkenli Fonksiyonlarda Türev

In this video, we try to understand derivatives not through formulas, but through geometry. How can a simple line connecting two points turn into one of the most powerful ideas in mathematics? A secant line becomes a tangent. The tangent gives the slope. And the slope is the derivative. In this video, we visualize the following ideas: • Secant line → Tangent line • Limit definition of the derivative • Formation of the derivative function • Critical points and the second derivative • Partial derivatives • Tangent plane • Gradient and contour lines • The idea of gradient descent In other words, a single idea of slope takes us from single-variable calculus to multivariable calculus. The geometric story of the derivative—one of the most powerful tools in mathematics—begins here.