What is the integral from-3 to 3 of sqrt(9-x^2) ?

The integral from-3 to 3 of sqrt(9-x^2) is (9pi)/2

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

integral from-3 to 3 of sqrt(9-x^2)

\int_{- 3}^{3} 9 - x^{2} d x

\frac{9 π}{2}

Decimal

14.13716 \dots

Solution steps

\int_{- 3}^{3} 9 - x^{2} d x

Apply Trigonometric Substitution

: \int_{- \frac{π}{2}}^{\frac{π}{2}} 9 cos^{2} (u) d u

= \int_{- \frac{π}{2}}^{\frac{π}{2}} 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_{- \frac{π}{2}}^{\frac{π}{2}} cos^{2} (u) d u

Rewrite using trig identities

= 9 \cdot \int_{- \frac{π}{2}}^{\frac{π}{2}} \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_{- \frac{π}{2}}^{\frac{π}{2}} 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_{- \frac{π}{2}}^{\frac{π}{2}} 1 d u + \int_{- \frac{π}{2}}^{\frac{π}{2}} cos (2 u) d u)

\int_{- \frac{π}{2}}^{\frac{π}{2}} 1 d u = π

\int_{- \frac{π}{2}}^{\frac{π}{2}} cos (2 u) d u = 0

= 9 \cdot \frac{1}{2} (π + 0)

Simplify

9 \cdot \frac{1}{2} (π + 0) : \frac{9 π}{2}

= \frac{9 π}{2}

\int_{- 2}^{2} (x^{2} - 4)^{2} d x

x \to 4 lim (\frac{x - 4}{x + 5})

\int (e^{2 x} \cdot, x) d x

\frac{8 \cdot x}{x ^{2} + p}

\int e^{x} \cdot e^{x} d x

What is the integral from-3 to 3 of sqrt(9-x^2) ?
The integral from-3 to 3 of sqrt(9-x^2) is (9pi)/2