What is the integral of 1/(sqrt(1+49x^2)) ?

The integral of 1/(sqrt(1+49x^2)) is 1/7 ln|7x+sqrt(1+49x^2)|+C

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integral of 1/(sqrt(1+49x^2))

\int \frac{1}{1 + 49 x ^{2}} d x

\frac{1}{7} ln 7 x + 1 + 49 x^{2} + C

Solution steps

\int \frac{1}{1 + 49 x ^{2}} d x

Apply Trigonometric Substitution

: \int \frac{sec ( u )}{7} d u

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

Use the common integral:

\int sec (u) d u = ln ∣ tan (u) + sec (u) ∣

= \frac{1}{7} ln ∣ tan (u) + sec (u) ∣

Substitute back

u = arctan (7 x)

= \frac{1}{7} ln ∣ tan (arctan (7 x)) + sec (arctan (7 x)) ∣

Simplify

\frac{1}{7} ln ∣ tan (arctan (7 x)) + sec (arctan (7 x)) ∣ : \frac{1}{7} ln 7 x + 1 + 49 x^{2}

= \frac{1}{7} ln 7 x + 1 + 49 x^{2}

Add a constant to the solution

= \frac{1}{7} ln 7 x + 1 + 49 x^{2} + C

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What is the integral of 1/(sqrt(1+49x^2)) ?
The integral of 1/(sqrt(1+49x^2)) is 1/7 ln|7x+sqrt(1+49x^2)|+C