Sr Examen
Integral de x^2cosnx dx
Solución
Ha introducido
[src]
pi / | | 2 | x *cos(n*x) dx | / 0
$$\int\limits_{0}^{\pi} x^{2} \cos{\left(n x \right)}\, dx$$
Integral(x^2*cos(n*x), (x, 0, pi))
Respuesta (Indefinida)
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// 3 \
|| x |
|| -- for n = 0|
|| 3 |
/ || |
| ||/sin(n*x) x*cos(n*x) | // x for n = 0\
| 2 |||-------- - ---------- for n != 0 | 2 || |
| x *cos(n*x) dx = C - 2*|<| 2 n | + x *|
$$\int x^{2} \cos{\left(n x \right)}\, dx = C + x^{2} \left(\begin{cases} x & \text{for}\: n = 0 \\\frac{\sin{\left(n x \right)}}{n} & \text{otherwise} \end{cases}\right) - 2 \left(\begin{cases} \frac{x^{3}}{3} & \text{for}\: n = 0 \\\frac{\begin{cases} - \frac{x \cos{\left(n x \right)}}{n} + \frac{\sin{\left(n x \right)}}{n^{2}} & \text{for}\: n \neq 0 \\0 & \text{otherwise} \end{cases}}{n} & \text{otherwise} \end{cases}\right)$$
Respuesta
[src]
/ 2 | 2*sin(pi*n) pi *sin(pi*n) 2*pi*cos(pi*n) |- ----------- + ------------- + -------------- for And(n > -oo, n < oo, n != 0) | 3 n 2 | n n < | 3 | pi | --- otherwise | 3 \
$$\begin{cases} \frac{\pi^{2} \sin{\left(\pi n \right)}}{n} + \frac{2 \pi \cos{\left(\pi n \right)}}{n^{2}} - \frac{2 \sin{\left(\pi n \right)}}{n^{3}} & \text{for}\: n > -\infty \wedge n < \infty \wedge n \neq 0 \\\frac{\pi^{3}}{3} & \text{otherwise} \end{cases}$$
=
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/ 2 | 2*sin(pi*n) pi *sin(pi*n) 2*pi*cos(pi*n) |- ----------- + ------------- + -------------- for And(n > -oo, n < oo, n != 0) | 3 n 2 | n n < | 3 | pi | --- otherwise | 3 \
$$\begin{cases} \frac{\pi^{2} \sin{\left(\pi n \right)}}{n} + \frac{2 \pi \cos{\left(\pi n \right)}}{n^{2}} - \frac{2 \sin{\left(\pi n \right)}}{n^{3}} & \text{for}\: n > -\infty \wedge n < \infty \wedge n \neq 0 \\\frac{\pi^{3}}{3} & \text{otherwise} \end{cases}$$
Piecewise((-2*sin(pi*n)/n^3 + pi^2*sin(pi*n)/n + 2*pi*cos(pi*n)/n^2, (n > -oo)∧(n < oo)∧(Ne(n, 0))), (pi^3/3, True))
Estos ejemplos se pueden aplicar para introducción de los límites de integración inferior y superior.