What is the integral of x^2sqrt(a^2-x^2) ?

The integral of x^2sqrt(a^2-x^2) is 1/8 a^4(arcsin(x/a)-1/4 sin(4arcsin(x/a)))+C

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integral of x^2sqrt(a^2-x^2)

\int x^{2} a^{2} - x^{2} d x

\frac{1}{8} a^{4} (arcsin (\frac{x}{a}) - \frac{1}{4} sin (4 arcsin (\frac{x}{a}))) + C

Solution steps

\int x^{2} a^{2} - x^{2} d x

Apply Trigonometric Substitution

: \int a^{4} sin^{2} (u) cos^{2} (u) d u

= \int a^{4} sin^{2} (u) cos^{2} (u) d u

Take the constant out:

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

= a^{4} \cdot \int sin^{2} (u) cos^{2} (u) d u

Rewrite using trig identities

= a^{4} \cdot \int \frac{1 - cos ( 4 u )}{8} d u

Take the constant out:

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

= a^{4} \frac{1}{8} \cdot \int 1 - cos (4 u) d u

Apply the Sum Rule:

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

= a^{4} \frac{1}{8} (\int 1 d u - \int cos (4 u) d u)

\int 1 d u = u

\int cos (4 u) d u = \frac{1}{4} sin (4 u)

= a^{4} \frac{1}{8} (u - \frac{1}{4} sin (4 u))

Substitute back

u = arcsin (\frac{1}{a} x)

= a^{4} \frac{1}{8} (arcsin (\frac{1}{a} x) - \frac{1}{4} sin (4 arcsin (\frac{1}{a} x)))

Simplify

a^{4} \frac{1}{8} (arcsin (\frac{1}{a} x) - \frac{1}{4} sin (4 arcsin (\frac{1}{a} x))) : \frac{1}{8} a^{4} (arcsin (\frac{x}{a}) - \frac{1}{4} sin (4 arcsin (\frac{x}{a})))

= \frac{1}{8} a^{4} (arcsin (\frac{x}{a}) - \frac{1}{4} sin (4 arcsin (\frac{x}{a})))

Add a constant to the solution

= \frac{1}{8} a^{4} (arcsin (\frac{x}{a}) - \frac{1}{4} sin (4 arcsin (\frac{x}{a}))) + C

f (x) = x^{3} - x

y^{^{''}} + 4 y^{^{'}} + 4 y = 64 cos (2 x)

\int (y - 2) d y

\frac{d}{d x} (\frac{cos ( 3 x )}{x})

y = (2 x - 1) (x + 4), (1, 5)

What is the integral of x^2sqrt(a^2-x^2) ?
The integral of x^2sqrt(a^2-x^2) is 1/8 a^4(arcsin(x/a)-1/4 sin(4arcsin(x/a)))+C