integral de xcos^2(x^2)

Solución

\int x cos^{2} (x^{2}) d x

\frac{1}{4} (x^{2} + \frac{1}{2} sin (2 x^{2})) + C

Pasos de solución

\int x cos^{2} (x^{2}) d x

Aplicar integración por sustitución

: \int \frac{cos ^{2} ( u )}{2} d u

= \int \frac{cos ^{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 cos^{2} (u) d u

Re-escribir usando identidades trigonométricas

= \frac{1}{2} \cdot \int \frac{1 + cos ( 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 \frac{1}{2} \cdot \int 1 + cos (2 u) 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

= \frac{1}{2} \cdot \frac{1}{2} (\int 1 d u + \int cos (2 u) d u)

\int 1 d u = u

\int cos (2 u) d u = \frac{1}{2} sin (2 u)

= \frac{1}{2} \cdot \frac{1}{2} (u + \frac{1}{2} sin (2 u))

Sustituir en la ecuación

u = x^{2}

= \frac{1}{2} \cdot \frac{1}{2} (x^{2} + \frac{1}{2} sin (2 x^{2}))

Simplificar

\frac{1}{2} \cdot \frac{1}{2} (x^{2} + \frac{1}{2} sin (2 x^{2})) : \frac{1}{4} (x^{2} + \frac{1}{2} sin (2 x^{2}))

= \frac{1}{4} (x^{2} + \frac{1}{2} sin (2 x^{2}))

Agregar una constante a la solución

= \frac{1}{4} (x^{2} + \frac{1}{2} sin (2 x^{2})) + C

\frac{d y}{d t} - \frac{4 t}{1 + 4 t ^{2}} y = 4 t

\frac{\partial}{\partial x} (1000)

f (x) = 4 e^{4 x}

\int 2 (1 - cos (x)) d x

\int \frac{1}{4 x - 1} d x