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integral de 0 a 7 de sin(8x^2)

Solución

\int_{0}^{7} sin (8 x^{2}) d x

\frac{1}{2 2} (\frac{π}{2} § (\frac{2}{π} \cdot 142) - \frac{π}{2} § (\frac{2}{π} \cdot 0))

Pasos de solución

\int_{0}^{7} sin (8 x^{2}) d x

Aplicar integración por sustitución

= \int_{0}^{14} \frac{1}{2} sin (2 u^{2}) d u

Sacar la constante:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= \frac{1}{2} \cdot \int_{0}^{14} sin (2 u^{2}) d u

Aplicar integración por sustitución

= \frac{1}{2} \cdot \int_{0}^{28} \frac{1}{2} sin (\frac{v ^{2}}{2}) d v

Sacar la constante:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= \frac{1}{2} \cdot \frac{1}{2} \cdot \int_{0}^{28} sin (\frac{v ^{2}}{2}) d v

Aplicar las leyes de los exponentes:

\frac{a ^{n}}{b ^{n}} = (\frac{a}{b})^{n}

\frac{v ^{2}}{2} = (\frac{v}{2})^{2}

= \frac{1}{2} \cdot \frac{1}{2} \cdot \int_{0}^{28} sin ((\frac{v}{2})^{2}) d v

Aplicar integración por sustitución

: \int_{0}^{142} sin (w^{2}) 2 d w

= \frac{1}{2} \cdot \frac{1}{2} \cdot \int_{0}^{142} sin (w^{2}) 2 d w

Sacar la constante:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= \frac{1}{2} \cdot \frac{1}{2} 2 \cdot \int_{0}^{142} sin (w^{2}) d w

Esta es una integral no elemental:

\int sin (x^{2}) d x = \frac{π}{2} § (\frac{2}{π} x)

= \frac{1}{2} \cdot \frac{1}{2} 2 [\frac{π}{2} § (\frac{2}{π} w)]_{0}^{142}

Simplificar

\frac{1}{2} \cdot \frac{1}{2} 2 [\frac{π}{2} § (\frac{2}{π} w)]_{0}^{142} : \frac{1}{2 2} [\frac{π}{2} § (\frac{2}{π} w)]_{0}^{142}

= \frac{1}{2 2} [\frac{π}{2} § (\frac{2}{π} w)]_{0}^{142}

Calcular los limites:

\frac{π}{2} § (\frac{2}{π} \cdot 142) - \frac{π}{2} § (\frac{2}{π} \cdot 0)

= \frac{1}{2 2} (\frac{π}{2} § (\frac{2}{π} \cdot 142) - \frac{π}{2} § (\frac{2}{π} \cdot 0))

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