Encontrar la integral \( \int \sin ^{2} \theta \cos ^{2} \theta d \theta \)
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Para resolver la integral \( \int \sin^{2} \theta \cos^{2} \theta d\theta \), primero podemos utilizar la identidad \( \sin^2 \theta \cos^2 \theta = \frac{1}{4} \sin^2(2\theta) \). Así, la integral se convierte en: \[ \int \sin^{2} \theta \cos^{2} \theta d\theta = \frac{1}{4} \int \sin^2(2\theta) d\theta. \] A continuación, aplicamos la identidad de reducción para la función seno: \[ \sin^2 x = \frac{1 - \cos(2x)}{2}. \] Por lo tanto, podemos escribir: \[ \int \sin^2(2\theta) d\theta = \int \frac{1 - \cos(4\theta)}{2} d\theta = \frac{1}{2} \int (1 - \cos(4\theta)) d\theta. \] Esto se evalúa como: \[ \frac{1}{2} \left( \theta - \frac{\sin(4\theta)}{4} \right) + C. \] Finalmente, combinando todo, tenemos: \[ \int \sin^{2} \theta \cos^{2} \theta d\theta = \frac{1}{4} \cdot \frac{1}{2} \left( \theta - \frac{\sin(4\theta)}{4} \right) + C = \frac{1}{8} \theta - \frac{1}{16} \sin(4\theta) + C. \]