What is the integral of 1/(y^2sqrt(y^2-7)) ?

The integral of 1/(y^2sqrt(y^2-7)) is (sqrt(y^2-7))/(7y)+C

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integral of 1/(y^2sqrt(y^2-7))

\int \frac{1}{y ^{2} y ^{2} - 7} d y

\frac{y ^{2} - 7}{7 y} + C

Solution steps

\int \frac{1}{y ^{2} y ^{2} - 7} d y

Apply Trigonometric Substitution

= \int \frac{1}{7 sec ( u )} d u

Take the constant out:

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

= \frac{1}{7} \cdot \int \frac{1}{sec ( u )} d u

Rewrite using trig identities

= \frac{1}{7} \cdot \int cos (u) d u

Use the common integral:

\int cos (u) d u = sin (u)

= \frac{1}{7} sin (u)

Substitute back

u = arcsec (\frac{1}{7} y)

= \frac{1}{7} sin (arcsec (\frac{1}{7} y))

Simplify

\frac{1}{7} sin (arcsec (\frac{1}{7} y)) : \frac{y ^{2} - 7}{7 y}

= \frac{y ^{2} - 7}{7 y}

Add a constant to the solution

= \frac{y ^{2} - 7}{7 y} + C

What is the integral of 1/(y^2sqrt(y^2-7)) ?
The integral of 1/(y^2sqrt(y^2-7)) is (sqrt(y^2-7))/(7y)+C