What is the integral of 3/(x^2sqrt(36-x^2)) ?

The integral of 3/(x^2sqrt(36-x^2)) is -(sqrt(36-x^2))/(12x)+C

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integral of 3/(x^2sqrt(36-x^2))

\int \frac{3}{x ^{2} 36 - x ^{2}} d x

- \frac{36 - x ^{2}}{12 x} + C

Solution steps

\int \frac{3}{x ^{2} 36 - x ^{2}} d x

Take the constant out:

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

= 3 \cdot \int \frac{1}{x ^{2} 36 - x ^{2}} d x

Apply Trigonometric Substitution

: \int \frac{cot ( u )}{36 cos ( u ) sin ( u )} d u

= 3 \cdot \int \frac{cot ( u )}{36 cos ( u ) sin ( u )} d u

Take the constant out:

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

= 3 \cdot \frac{1}{36} \cdot \int \frac{cot ( u )}{cos ( u ) sin ( u )} d u

Simplify

\frac{cot ( u )}{cos ( u ) sin ( u )} : csc^{2} (u)

= 3 \cdot \frac{1}{36} \cdot \int csc^{2} (u) d u

Use the common integral:

\int csc^{2} (u) d u = - cot (u)

= 3 \cdot \frac{1}{36} (- cot (u))

Substitute back

u = arcsin (\frac{1}{6} x)

= 3 \cdot \frac{1}{36} (- cot (arcsin (\frac{1}{6} x)))

Simplify

3 \cdot \frac{1}{36} (- cot (arcsin (\frac{1}{6} x))) : - \frac{36 - x ^{2}}{12 x}

= - \frac{36 - x ^{2}}{12 x}

Add a constant to the solution

= - \frac{36 - x ^{2}}{12 x} + C

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What is the integral of 3/(x^2sqrt(36-x^2)) ?
The integral of 3/(x^2sqrt(36-x^2)) is -(sqrt(36-x^2))/(12x)+C