User Tools

Site Tools


chain_rules

This is an old revision of the document!


Chain rules

\begin{eqnarray*} y & = & f(t) \\ t & = & g(x) \\ y & =& f(g(x)) \\ \frac {dy}{dx} & = & \frac {dy}{dt} * \frac {dt}{dx} \\ & & \frac {dy}{dt} = f'(t) = f'(g(x)) \\ & & \because{ \frac {dt}{dx} = g'(x) } \\ & & \frac {dy}{dx} = f'(g(x)) * g'(x) \\ \end{eqnarray*}

\begin{eqnarray*} y & = & (2x^2 + 1)^2 \\ t & = & 2x^2 + 1 \\ y & = & t^2 \\ t & = & 2x^2 + 1 \\ \frac{dy}{dt} & = & 2t \\ & = & 2 (2x^2 + 1) \\ & = & (4x^2 + 2) \\ \frac{dt}{dx} & = & 4x \\ \therefore{} \frac{dy}{dx} & = & \frac{dy}{dt}*\frac{dt}{dx} \\ & = & (4x^2 + 2) * 4x \\ & = & 16x^3 + 8x \\ \end{eqnarray*}

chain_rules.1754309761.txt.gz · Last modified: 2025/08/04 21:16 by hkimscil

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki