Lagrang metodasi, shuningdek, o'zgaruvchanlik kalkulyasi deb ham tanilgan, bu funksiyaning ekstremasini (minimal yoki maksimal) topish uchun ishlatiladigan matematik usuldir. Lagrang metodasi asosiy tenglamasi Euler-Lagrange tenglamasi. Euler-Lagrange tenglamasi eng kam harakat printsipi asosida hosil bo'ladi va quyidagicha beriladi: $ $ \frac{\partial L} {\partial y} - \frac{d} {dx} \left\\frac{\partial L} {\partial y'\} right) = 0 $ $ $ bu erda L Lagrang funksiyasi, y - bog'liq o'zgaruvchi, y' - y'ning mustaqil o'zgaruvchisi, y' - y'ning hosilasi, x ∂ / y / y / y ∂
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