Page Wyatt
09/03/2023 · Elementary School

\( \operatorname { Sec } ^ { 2 } \alpha ( 1 - \cos ^ { 2 } \alpha ) = \operatorname { Tg } ^ { 2 } \alpha \)

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Para demostrar la identidad \( \sec^2 \alpha (1 - \cos^2 \alpha) = \tan^2 \alpha \), comenzamos recordando algunas identidades trigonométricas fundamentales. Sabemos que: 1. \( \sec^2 \alpha = \frac{1}{\cos^2 \alpha} \) 2. \( \tan^2 \alpha = \frac{\sin^2 \alpha}{\cos^2 \alpha} \) 3. La identidad pitagórica: \( \sin^2 \alpha + \cos^2 \alpha = 1 \), lo que implica que \( \sin^2 \alpha = 1 - \cos^2 \alpha \). Ahora, sustituyamos \( 1 - \cos^2 \alpha \) en la expresión original: \[ 1 - \cos^2 \alpha = \sin^2 \alpha \] Sustituyendo esto en la ecuación: \[ \sec^2 \alpha (1 - \cos^2 \alpha) = \sec^2 \alpha \sin^2 \alpha \] Ahora, sustituimos \( \sec^2 \alpha \): \[ \sec^2 \alpha \sin^2 \alpha = \frac{1}{\cos^2 \alpha} \sin^2 \alpha \] Esto se puede simplificar a: \[ \frac{\sin^2 \alpha}{\cos^2 \alpha} = \tan^2 \alpha \] Por lo tanto, hemos demostrado que: \[ \sec^2 \alpha (1 - \cos^2 \alpha) = \tan^2 \alpha \] Así que la identidad es verdadera.

Quick Answer

Demostramos que \( \sec^2 \alpha (1 - \cos^2 \alpha) = \tan^2 \alpha \) usando identidades trigonométricas básicas.
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