integral de 5sec^6(x)

Solución

\int 5 sec^{6} (x) d x

5 tan (x) + \frac{10}{3} tan^{3} (x) + tan^{5} (x) + C

Pasos de solución

\int 5 sec^{6} (x) d x

Sacar la constante:

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

= 5 \cdot \int sec^{6} (x) d x

Re-escribir usando identidades trigonométricas

= 5 \cdot \int sec^{2} (x) (1 + tan^{2} (x))^{2} d x

Aplicar integración por sustitución

: \int (1 + u^{2})^{2} d u

= 5 \cdot \int (1 + u^{2})^{2} d u

Expandir

(1 + u^{2})^{2} : 1 + 2 u^{2} + u^{4}

= 5 \cdot \int 1 + 2 u^{2} + u^{4} d u

Aplicar la regla de la suma:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 5 (\int 1 d u + \int 2 u^{2} d u + \int u^{4} d u)

\int 1 d u = u

\int 2 u^{2} d u = \frac{2 u ^{3}}{3}

\int u^{4} d u = \frac{u ^{5}}{5}

= 5 (u + \frac{2 u ^{3}}{3} + \frac{u ^{5}}{5})

Sustituir en la ecuación

u = tan (x)

= 5 (tan (x) + \frac{2 tan ^{3} ( x )}{3} + \frac{tan ^{5} ( x )}{5})

Simplificar

5 (tan (x) + \frac{2 tan ^{3} ( x )}{3} + \frac{tan ^{5} ( x )}{5}) : 5 tan (x) + \frac{10}{3} tan^{3} (x) + tan^{5} (x)

= 5 tan (x) + \frac{10}{3} tan^{3} (x) + tan^{5} (x)

Agregar una constante a la solución

= 5 tan (x) + \frac{10}{3} tan^{3} (x) + tan^{5} (x) + C

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