What is the integral of sqrt(13-4x^2) ?

The integral of sqrt(13-4x^2) is 13/4 (arcsin(2/(sqrt(13))x)+1/2 sin(2arcsin(2/(sqrt(13))x)))+C

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integral of sqrt(13-4x^2)

\int 13 - 4 x^{2} d x

\frac{13}{4} (arcsin (\frac{2}{13} x) + \frac{1}{2} sin (2 arcsin (\frac{2}{13} x))) + C

Solution steps

\int 13 - 4 x^{2} d x

Apply Trigonometric Substitution

: \int \frac{13}{2} cos^{2} (u) d u

= \int \frac{13}{2} cos^{2} (u) d u

Take the constant out:

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

= \frac{13}{2} \cdot \int cos^{2} (u) d u

Rewrite using trig identities

= \frac{13}{2} \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

= \frac{13}{2} \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

= \frac{13}{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{13}{2} \cdot \frac{1}{2} (u + \frac{1}{2} sin (2 u))

Substitute back

u = arcsin (\frac{2}{13} x)

= \frac{13}{2} \cdot \frac{1}{2} (arcsin (\frac{2}{13} x) + \frac{1}{2} sin (2 arcsin (\frac{2}{13} x)))

Simplify

\frac{13}{2} \cdot \frac{1}{2} (arcsin (\frac{2}{13} x) + \frac{1}{2} sin (2 arcsin (\frac{2}{13} x))) : \frac{13}{4} (arcsin (\frac{2}{13} x) + \frac{1}{2} sin (2 arcsin (\frac{2}{13} x)))

= \frac{13}{4} (arcsin (\frac{2}{13} x) + \frac{1}{2} sin (2 arcsin (\frac{2}{13} x)))

Add a constant to the solution

= \frac{13}{4} (arcsin (\frac{2}{13} x) + \frac{1}{2} sin (2 arcsin (\frac{2}{13} x))) + C

d y = cos (x - y) d x

\int_{0}^{\infty} 5 sin^{2} (x) d x

\int_{1}^{6} \frac{x ^{2} + 6}{7 x - x ^{2}} d x

\frac{d}{d t} (\frac{6}{5} - \frac{6}{5} e^{- 20 t})

n = 0 \sum \infty \frac{1}{n - 1}

What is the integral of sqrt(13-4x^2) ?
The integral of sqrt(13-4x^2) is 13/4 (arcsin(2/(sqrt(13))x)+1/2 sin(2arcsin(2/(sqrt(13))x)))+C