What is the integral of (9-x^2)^{1/2} ?

The integral of (9-x^2)^{1/2} is 9/2 (arcsin(1/3 x)+1/2 sin(2arcsin(1/3 x)))+C

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integral of (9-x^2)^{1/2}

\int (9 - x^{2})^{\frac{1}{2}} d x

\frac{9}{2} (arcsin (\frac{1}{3} x) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} x))) + C

Solution steps

\int (9 - x^{2})^{\frac{1}{2}} d x

Apply Trigonometric Substitution

: \int 9 cos^{2} (u) d u

= \int 9 cos^{2} (u) d u

Take the constant out:

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

= 9 \cdot \int cos^{2} (u) d u

Rewrite using trig identities

= 9 \cdot \int \frac{1 + cos ( 2 u )}{2} d u

Take the constant out:

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

= 9 \cdot \frac{1}{2} \cdot \int 1 + cos (2 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

= 9 \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)

= 9 \cdot \frac{1}{2} (u + \frac{1}{2} sin (2 u))

Substitute back

u = arcsin (\frac{1}{3} x)

= 9 \cdot \frac{1}{2} (arcsin (\frac{1}{3} x) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} x)))

Simplify

9 \cdot \frac{1}{2} (arcsin (\frac{1}{3} x) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} x))) : \frac{9}{2} (arcsin (\frac{1}{3} x) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} x)))

= \frac{9}{2} (arcsin (\frac{1}{3} x) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} x)))

Add a constant to the solution

= \frac{9}{2} (arcsin (\frac{1}{3} x) + \frac{1}{2} sin (2 arcsin (\frac{1}{3} x))) + C

sin (4 x)

(t - 1)^{3}

\frac{d}{d x} (\frac{( x ^{2} - 5 x )}{x - 2})

\frac{x ^{2}}{5 + 2 x}

(x^{2} - 1)^{3}

What is the integral of (9-x^2)^{1/2} ?
The integral of (9-x^2)^{1/2} is 9/2 (arcsin(1/3 x)+1/2 sin(2arcsin(1/3 x)))+C